Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
vien thanh » viet thanh, tien thanh, dien thanh
hang cong » dang cong, hang nong, bang cong
tranh va » tranh van, trang va, trinh va
san toan » van toan, dan toan, manh toan
van tuan » van quan, van ban, anh tuan
va hang » van hang, va nang, va lang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu nganh) or (vien thanh)) - canh tranh va hang cong ((san toan) or (van tuan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu nganh) OR (vien thanh)) - canh tranh va hang cong ((san toan) OR (van tuan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu nganh) or (vien thanh)) - canh tranh va hang cong ((san toan) or (van tuan)) cao*.