Perhaps you should try some spelling variations:
hieu tinh » chieu tinh, kieu tinh, hieu binh
lieu tinh » trieu tinh, diep tinh, bien tinh
manh hung » anh huong
hung chuc » hung chu, nhung khuc, khong chuc
nang cong » nang song, dang cong, bang cong
van toan » van tan, van thanh, manh toan
van tuan » van quan, van ban, anh tuan

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 tinh) or (lieu tinh)) - manh hung chuc nang cong ((van toan) or (van tuan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu tinh) OR (lieu tinh)) - manh hung chuc nang cong ((van toan) OR (van tuan)) ban.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu tinh) or (lieu tinh)) - manh hung chuc nang cong ((van toan) or (van tuan)) ban*.