Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
dang thuoc » dung thuoc
hoc thieu » toc thieu, hoc hien
trong van » trong cac
nang dua » nang du, nang suat, nang quan
van toan » van tuan, van tan, van thanh
toan tap » toan ban

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 (dang thuoc)) dung trong van toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - anh ((nang dua) OR (dang thuoc)) dung trong van toan tap*.