Perhaps you should try some spelling variations:
thieu sang » thieu khang, thieu quang, hieu lang
chieu sang » chieu sach, chieu xanh, hieu lang
tinh ninh » ninh binh
hang cong » dang cong, hang nong, bang cong
ninh vat » sinh vat, dinh vat, tinh vat
vat hang » van hang, dat hang, va hang
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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) or (chieu sang)) - tinh ninh vat hang cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (chieu sang)) - tinh ninh vat hang cong dan toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (chieu sang)) - tinh ninh vat hang cong dan toan ban*.