Perhaps you should try some spelling variations:
thanh cung » thanh cuong, thanh cong, thanh tung
hoc thieu » toc thieu, hoc hien
dang cong » dung cong
bang cong » bang song, hang cong, dung cong
ho chieu » theo chieu, doi chieu, mot chieu
cung cap » trung cap
tap toan » tap doan, tap quan, bai toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (hoc thieu)) sach - thanh cung cap ((dang cong) or (bang cong)) tap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) sach - thanh cung cap ((dang cong) OR (bang cong)) tap toan ban.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) sach - thanh cung cap ((dang cong) or (bang cong)) tap toan ban*.