Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
thu nang » thi nang, thu hang, thu bang
chuc van » chu van, chuc va, thuc van
ve pham » v pham, ve phan, ve phat
so sach » bo sach, co sach, hoc sach
nang ma » tang ma, sang ma, nang cao
so sanh » do sanh
ma hoi » mai hoi, xa hoi, ma hoa
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 ma hoi. hieu ((ve pham) OR (vi pham)) chuc van hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) thu nang ma hoi. hieu ((ve pham) OR (vi pham)) chuc van hanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (so sanh)) thu nang ma hoi. hieu ((ve pham) OR (vi pham)) chuc van hanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) thu nang ma hoi. hieu ((ve pham) OR (vi pham)) chuc van hanh dai cua te*.