Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoang tinh » hoang thinh, hoang minh, hoang dinh
hoc thieu » toc thieu, hoc hien
cong lang » cong luong, cong quang, cong ngang
cong vang » cong quang, cong ngang, cong san
cong tac » cong ty
toan cao » toan ban, toan tap
tinh va » tich va, trinh van, trinh 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 sach - hoang tinh va nhung ((((cong lang) or (cong vang))) or (cong tac)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hoang tinh va nhung ((((cong lang) OR (cong vang))) OR (cong tac)) toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hoang tinh va nhung ((((cong lang) or (cong vang))) or (cong tac)) toan cao*.