Perhaps you should try some spelling variations:
pham chuc » pham duc, pham huu, kham chua
hieu van » hieu va, thien van, lieu va
vanh dai » van dai, vanh tai, lanh dao
thi nang » thi cong, ki nang, thi hanh
co sach » bo sach, cuon sach, hoc sach
va vanh » va van, va danh, va hanh
chuc va » thuc va, thuc vat
hieu ve » hieu va
nang co » nang cao, nang doc, nang noi
so sanh » do sanh
co hoi » co hoc, co loi
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((co sach) or (so sanh)) thi nang co hoi. ((hieu ve) OR (hieu van)) pham chuc va vanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co sach) OR (so sanh)) thi nang co hoi. ((hieu ve) OR (hieu van)) pham chuc va vanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((co sach) or (so sanh)) thi nang co hoi. ((hieu ve) OR (hieu van)) pham chuc va vanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: ((co sach) or (so sanh)) thi nang co hoi. ((hieu ve) OR (hieu van)) pham chuc va vanh dai cua te*.