Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
toan ban » van ban
tung va » trung va, tuong va, dung va

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 sang - thanh tung va nhung ((cong tan) or (cong tac)) ((toan tap) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh tung va nhung ((cong tan) OR (cong tac)) ((toan tap) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh tung va nhung ((cong tan) or (cong tac)) ((toan tap) or (toan ban))*.