Perhaps you should try some spelling variations:
nhung cong » dung cong, hang cong, nhung don
canh trinh » canh tranh, hanh trinh, canh tinh
thong cong » trong cong, thong thong, phong chong
hieu lang » chieu sang, hieu quang, nhieu tang
trinh dap » trinh lap, trinh da, trinh dan
tong cong » trong cong, cong cong, dung cong
hoc hieu » hoc thieu, hoc hien, doc hieu
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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 lang - canh trinh dap ((nhung cong) or (((thong cong) or (tong cong)))) dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - canh trinh dap ((nhung cong) OR (((thong cong) OR (tong cong)))) dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - canh trinh dap ((nhung cong) or (((thong cong) or (tong cong)))) dan than cau*.