Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
trung cap » truong cao, trung tam
cong vang » cong lang, cong quang, cong ngang
vang than » sang than, van than, cang thang
thong tu » phong tuc, thong tin, thong ke
than cau » toan cau, phan cau, than cap

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 ((thong tu) or (trung cap)) trong cong vang than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh ((thong tu) OR (trung cap)) trong cong vang than cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh ((thong tu) or (trung cap)) trong cong vang than cau*.