Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
canh tang » anh tang, canh tranh, cang thang
cong tinh » cong trinh, cong vinh, cong thanh
long tinh » trong tinh, luong tin, dong tin
tang vat » tang van, dang vat, bang vat
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 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 vat dung ((cong tinh) OR (long tinh)) toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - canh tang vat dung ((cong tinh) OR (long tinh)) toan ban*.