Perhaps you should try some spelling variations:
pham chuc » pham duc, pham huu, kham chua
hanh hai » thanh hai, nhanh hai, hang hai
thu nang » thi nang, thu hang, thu bang
so sach » bo sach, co sach, hoc sach
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
chuc va » thuc va, thuc vat
ve pham » vi pham, v pham, ve phan
dai hoi » dai hoc, dai hai, dai moi
hieu ve » hieu va, hieu van
mai hoi » mai khoi, lai hoi, mai doi
so sanh » do sanh
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: ((so sach) or (so sanh)) thu nang ((mai hoi) OR (dai hoi)). hieu ve pham chuc va hanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) thu nang ((mai hoi) OR (dai hoi)). hieu ve pham chuc va hanh hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (so sanh)) thu nang ((mai hoi) OR (dai hoi)). hieu ve pham chuc va hanh hai cua te".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) thu nang ((mai hoi) OR (dai hoi)). hieu ve pham chuc va hanh hai cua te*.