Perhaps you should try some spelling variations:
luan nhung » luan chung, luan hung, quan nhung
hieu manh » chieu xanh, hieu nganh, dieu hanh
cong vang » cong lang, cong quang, cong ngang
hoc hieu » hoc thieu, hoc hien, doc hieu
anh dung » anh dong, anh huong, sach dung
cong van » song van, cong tan, cong va
cong san » cong tac
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: hoc hieu manh - anh dung luan nhung ((((cong van) or (cong vang))) or (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - anh dung luan nhung ((((cong van) OR (cong vang))) OR (cong san)) toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - anh dung luan nhung ((((cong van) or (cong vang))) or (cong san)) toan cau*.