Perhaps you should try some spelling variations:
thieu hach » thien hach, chieu sach, hieu cach
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
trinh van » trinh han, trinh quan, trinh toan
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap
tinh va » trinh vat, tinh gia, sinh vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu hach - nhanh ((((tinh va) or (tich va))) or (trinh van)) nhung cong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu hach - nhanh ((((tinh va) OR (tich va))) OR (trinh van)) nhung cong tan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu hach - nhanh ((((tinh va) or (tich va))) or (trinh van)) nhung cong tan toan cao*.