Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hoc thieu » toc thieu, hoc hien
cong chuc » cong thuc, cong cu, cong cua
dung cong » dung trong
cong vang » cong lang, cong quang, cong ngang
cong cac » cuong cac, cong tac, cong cau
vang tan » van tan, tang tan, vang tao
tan cau » toan cau, van cau, tan ca

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 cac) or (cong chuc)) dung cong vang tan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - thanh ((cong cac) OR (cong chuc)) dung cong vang tan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - thanh ((cong cac) or (cong chuc)) dung cong vang tan cau*.