Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhan dang » nhan dan, phan dang, tran dang
cong vang » cong lang, cong quang, cong ngang
dang cua » dung cua, dong cua, mang cua
cua dung » cua dang, cua dong, qua dung
cong van » cong san, song van, cong tan
than cao » toan cao, thai cao, than cap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu quang) OR (chieu tinh)) - nhan dang cua dung ((cong van) OR (cong vang)) than cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu quang) or (chieu tinh)) - nhan dang cua dung ((cong van) OR (cong vang)) than cao~".
• Adding a wildcard symbol may retrieve word variants: doi ((hieu quang) or (chieu tinh)) - nhan dang cua dung ((cong van) OR (cong vang)) than cao*.