Perhaps you should try some spelling variations:
"te khac thi nghiem va hoc" » "te khac thuc nghiem va hoc", "te khac thi nghiep va hoc", "te khac thi nghiep vua hoc", "te khac thi nghiep vu hoc", "te khau thi nghiem va hoc", "te khuc thi nghiem va hoc", "te khuat thi nghiem va hoc", "de khac thi nghiem va hoc", "se khac thi nghiem va hoc", "le khac thi nghiem va hoc", "te khac thi nghiem van hoc"
"he khach thai nghe lam hoc" » "he khach trai nghe lam hoc", "he khac trai nghe lam hoc", "he nhanh thai nghe lam hoc", "le khanh thai nghe lam hoc", "he khach thai nghe dan hoc", "he khach thai nghe va hoc", "he khach thai nghe san hoc", "he khach thai nghe am hoc", "he khach thai nghe lam hoa", "he khach thai nghe tam hoc"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("he khach thai nghe lam hoc") or ("te khac thi nghiem va hoc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("he khach thai nghe lam hoc") OR ("te khac thi nghiem va hoc")).
• Removing quotes may allow a broader search: (( he khach thai nghe lam hoc ) or ( te khac thi nghiem va hoc )).
• Adding a wildcard symbol may retrieve word variants: (("he khach thai nghe lam hoc") or ("te khac thi nghiem va hoc"))*.