Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
chieu tinh » trieu tinh, lieu tinh, chau tinh
anh xquang » anh quan, anh xuan
cong thanh » dong thanh, cong trinh, cong tan
thanh than » thanh thanh, thanh thang, thanh toan
anh quang » anh quan, nhanh quang, tinh quang
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu nganh) or (chieu tinh)) - ((anh quang) OR (anh xquang)) cua dung cong thanh than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu nganh) OR (chieu tinh)) - ((anh quang) OR (anh xquang)) cua dung cong thanh than cap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((hieu nganh) or (chieu tinh)) - ((anh quang) OR (anh xquang)) cua dung cong thanh than cap*".