Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thieu sang » chieu sang, thieu khang, hieu lang
canh trinh » canh tranh, hanh trinh, canh tinh
thanh toan » thanh san, tinh toan
trinh vat » trinh van, trinh luat, sinh vat
hang cong » dang cong, hang nong, bang cong
thanh hoa » thanh pho
vat hang » van hang, dat hang, va hang

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 (thieu quang)) - canh trinh vat hang cong ((thanh toan) OR (thanh hoa)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu quang)) - canh trinh vat hang cong ((thanh toan) OR (thanh hoa)) tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (thieu quang)) - canh trinh vat hang cong ((thanh toan) OR (thanh hoa)) tap*".