Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
thanh tung » thanh cong
trinh quan » tinh quang, trinh luat, trinh han
thanh toan » thanh hoa, thanh san, tinh toan
hieu lang » chieu sang, nhieu tang, hieu van
dang cong » dung cong
tung cap » trung cap, cung cap, thong cap
cap dang » cao dang, cac dang, cap bang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu lang) OR (hieu quang)) - thanh tung cap dang cong ((trinh quan) or (thanh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - thanh tung cap dang cong ((trinh quan) OR (thanh toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) OR (hieu quang)) - thanh tung cap dang cong ((trinh quan) or (thanh toan)) cau".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) OR (hieu quang)) - thanh tung cap dang cong ((trinh quan) or (thanh toan)) cau*.