Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thong cong » trong cong, tong cong, thong thong
tinh cua » trinh cua, sinh cua, tranh cua
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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

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