Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu xanh » chieu xanh, hieu manh, hieu nganh
trung vap » trung cap, trung van, trung lap
doc hieu » toc thieu, hoc thieu, hoc hien
trung va » truong va, trang va, trung ha
cong tan » cong tac, cong san, cong thanh
tran cao » toan cao, tran chau, trang cho

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 - manh ((trung vap) OR (trung va)) nhung cong tan tran cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - manh ((trung vap) OR (trung va)) nhung cong tan tran cao".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - manh ((trung vap) OR (trung va)) nhung cong tan tran cao*.