Perhaps you should try some spelling variations:
trinh thuat » trinh luat, trinh thuc, trinh chat
trinh thiet » trinh viet, trinh thi
hieu xanh » chieu xanh, hieu manh, hieu nganh
bang cong » dang cong, bang song, dung cong
hang cong » dang cong, hang nong, thanh cong
doc hieu » toc thieu, hoc thieu, hoc hien
tran huu » tran duc

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 - hanh ((trinh thuat) or (trinh thiet)) ((bang cong) or (hang cong)) tan tran huu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh ((trinh thuat) OR (trinh thiet)) ((bang cong) OR (hang cong)) tan tran huu.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh ((trinh thuat) or (trinh thiet)) ((bang cong) or (hang cong)) tan tran huu*.