Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
nhanh lang » nhanh quang, nhanh thang, nhan dang
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
anh tang » anh bang, anh dang, anh nang
cong dan » cong san, cong tan, huong dan
than tap » toan tap, phan tap, than cap
han tap » han tai, toan tap, nhan tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu xanh - ((anh tang) or (nhanh lang)) va nhung cong dan ((than tap) or (han tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - ((anh tang) OR (nhanh lang)) va nhung cong dan ((than tap) OR (han tap)).
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((anh tang) or (nhanh lang)) va nhung cong dan ((than tap) or (han tap))*.