Perhaps you should try some spelling variations:
thong trinh » thong tinh, chuong trinh, phuong trinh
hieu quang » thieu quang, hieu quan, hieu qua
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
hieu lang » chieu sang, nhieu tang, hieu van
cua thong » cua thuong, cua khong, cua tong
tinh cua » trinh cua, sinh cua, tinh chat
han dau » hang dau, phan dau, ban dau
van dau » van dao, phan dau

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)) - nhanh tinh cua thong thong trinh ((han dau) OR (van dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - nhanh tinh cua thong thong trinh ((han dau) OR (van dau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (hieu quang)) - nhanh tinh cua thong thong trinh ((han dau) OR (van dau))".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) or (hieu quang)) - nhanh tinh cua thong thong trinh ((han dau) OR (van dau))*.