Perhaps you should try some spelling variations:
trinh thuat » trinh luat, trinh thiet, trinh thuc
hanh trinh » canh tranh, hanh chinh
chieu xanh » chieu sach, chieu sang, chieu tinh
nhung cong » thong cong, hang cong, nhung don
hieu xanh » hieu manh, hieu nganh, dieu hanh
dung cong » dung trong
tran chau » tranh chap, tran huu

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) or (chieu xanh)) - hanh trinh thuat ((nhung cong) OR (dung cong)) tan tran chau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (chieu xanh)) - hanh trinh thuat ((nhung cong) OR (dung cong)) tan tran chau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) or (chieu xanh)) - hanh trinh thuat ((nhung cong) OR (dung cong)) tan tran chau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (chieu xanh)) - hanh trinh thuat ((nhung cong) OR (dung cong)) tan tran chau*.