Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van thanh » ban thanh, van tuan
voi pham » vi pham, toi pham, loai pham
hieu voi » hieu moi, lieu voi, hieu loi
duc van » duc va, duc tan, duc manh
so sach » so sanh, bo sach, co sach
lai cua » dai cua, lai chau, thai cua
hai cua » thai cua, dai cua, hoi cua
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuat sach) or (so sach)) ky nang o hoi. hieu voi pham duc van thanh ((lai cua) OR (hai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (so sach)) ky nang o hoi. hieu voi pham duc van thanh ((lai cua) OR (hai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat sach) or (so sach)) ky nang o hoi. hieu voi pham duc van thanh ((lai cua) OR (hai cua)) te".
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (so sach)) ky nang o hoi. hieu voi pham duc van thanh ((lai cua) OR (hai cua)) te*.