Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, diep quang
thong cong » trong cong, tong cong, thong thong
trinh cua » trinh luat, trinh quan, trinh luan
tinh cua » sinh cua, tinh chat, tranh cua
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
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: ho ((hieu quang) or (hieu qua)) - thanh ((tinh cua) OR (trinh cua)) thong cong dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quang) OR (hieu qua)) - thanh ((tinh cua) OR (trinh cua)) thong cong dan toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu quang) or (hieu qua)) - thanh ((tinh cua) OR (trinh cua)) thong cong dan toan tap".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quang) or (hieu qua)) - thanh ((tinh cua) OR (trinh cua)) thong cong dan toan tap*.