Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
canh tang » canh tranh, cang thang, hanh trang
cong tinh » cong trinh, cong vinh, cong thanh
long tinh » trong tinh, luong tin, dong tin
anh tang » anh bang, anh dang, anh nang
vat dung » van dung, va dung, viet dung
toan ban » van ban

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 tang) OR (anh tang)) vat dung ((cong tinh) or (long tinh)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - ((canh tang) OR (anh tang)) vat dung ((cong tinh) OR (long tinh)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - ((canh tang) OR (anh tang)) vat dung ((cong tinh) or (long tinh)) toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - ((canh tang) OR (anh tang)) vat dung ((cong tinh) or (long tinh)) toan ban*.