Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
cach dung » sach dung, cach mang, anh dung
cong vang » cong lang, cong quang, cong ngang
tac dung » sach dung, xay dung, tin dung
toan cau » toan cao, toan tap, toan tai
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: hoc thieu sach - thanh cong ((tac dung) or (cach dung)) cong vang ((toan cau) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - thanh cong ((tac dung) OR (cach dung)) cong vang ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - thanh cong ((tac dung) or (cach dung)) cong vang ((toan cau) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh cong ((tac dung) or (cach dung)) cong vang ((toan cau) OR (toan ban))*.