Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
tranh va » tranh van, trang va, trinh va
trinh ve » trinh he, trinh va, trinh vi
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan cao » toan ban, toan tap

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 - canh ((tranh va) or (trinh ve)) nhung ((cong tan) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - canh ((tranh va) OR (trinh ve)) nhung ((cong tan) OR (cong san)) toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - canh ((tranh va) or (trinh ve)) nhung ((cong tan) or (cong san)) toan cao*.