Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
trong tuan » trong quan, trung tuan, trong tan
hoc thieu » toc thieu, hoc hien
tran xuan » tran quang, tran van
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
toan cau » toan cao, toan ban, toan tap

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 - hanh ((tran xuan) or (trong tuan)) hang ((cong tan) or (cong tac)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh ((tran xuan) OR (trong tuan)) hang ((cong tan) OR (cong tac)) toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((tran xuan) or (trong tuan)) hang ((cong tan) or (cong tac)) toan cau*.