Perhaps you should try some spelling variations:
thieu quang » thien quan, trien quang, hieu quan
thanh trung » thanh tung
hieu quang » hieu quan, hieu qua, diep quang
trung va » truong va, trang va, trung ha
va thong » va thuong, va phuong, he thong
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi ((hieu quang) OR (thieu quang)) - thanh trung va thong ((cong dan) or (cong tan)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi ((hieu quang) OR (thieu quang)) - thanh trung va thong ((cong dan) OR (cong tan)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi ((hieu quang) OR (thieu quang)) - thanh trung va thong ((cong dan) or (cong tan)) toan tap".
• Adding a wildcard symbol may retrieve word variants: hoi ((hieu quang) OR (thieu quang)) - thanh trung va thong ((cong dan) or (cong tan)) toan tap*.