Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
canh trinh » canh tranh, hanh trinh, canh tinh
hoc thieu » toc thieu, hoc hien
trinh vap » trinh van, trinh vat, trinh va
vap nhung » va nhung, ve nhung, voi nhung
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
phan cau » phan dau, phan cac, phan tu

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 - canh trinh vap nhung ((cong dan) or (cong san)) phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - canh trinh vap nhung ((cong dan) OR (cong san)) phan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - canh trinh vap nhung ((cong dan) or (cong san)) phan cau*.