Perhaps you should try some spelling variations:
vien nganh » vien thanh
hanh trinh » canh tranh, hanh chinh
tuong bang » cuong bang, muong bang, trong bang
hieu xanh » chieu xanh, hieu manh, hieu nganh
tuong ban » trong ban, tuong dan, tuong quan
trinh ha » trinh han, trinh hoa, trinh nha
than cau » toan cau, phan cau, than cap
ha hang » nha hang, ha tang, va hang

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)) - hanh trinh ha hang ((tuong ban) OR (tuong bang)) than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (vien nganh)) - hanh trinh ha hang ((tuong ban) OR (tuong bang)) than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) or (vien nganh)) - hanh trinh ha hang ((tuong ban) OR (tuong bang)) than cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (vien nganh)) - hanh trinh ha hang ((tuong ban) OR (tuong bang)) than cau*.