Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hien quang » dien quang, bien quang, hien quan
cong thanh » dong thanh, cong trinh, cong tan
ganh nang » nganh nong, van nang, sach nang
anh nang » anh bang, anh dang, anh sang
toan cao » toan tap
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien quang - ((anh nang) or (ganh nang)) va nhung cong thanh ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien quang - ((anh nang) OR (ganh nang)) va nhung cong thanh ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc hien quang - ((anh nang) or (ganh nang)) va nhung cong thanh ((toan cao) or (toan ban))*.