Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
nang thuc » dang thuoc, nhanh thuc, trang thuc
trong van » trong cac
nang dua » nang du, nang suat, nang quan
van toan » van tuan, van tan, van thanh
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 - anh ((nang dua) or (nang thuc)) dung trong van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - anh ((nang dua) OR (nang thuc)) dung trong van toan cao*.