Perhaps you should try some spelling variations:
vien nganh » vien thanh
canh trinh » canh tranh, hanh trinh, canh tinh
tang huong » tang cuong, tang duong, hang thuong
hieu xanh » chieu xanh, hieu manh, hieu nganh
huong ban » huong dan, huong ben, huong lan
trinh ha » trinh han, trinh hoa, trinh nha
ban than » ban thanh, van thanh, ban hang
than cap » khan cap, thanh lap, thanh cac
ha tang » phap tang, cao tang, kho tang

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 (vien nganh)) - canh trinh ha tang huong ban than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (vien nganh)) - canh trinh ha tang huong ban than cap.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (vien nganh)) - canh trinh ha tang huong ban than cap*.