Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
ve pham » vi pham, v pham, ve phan
hai cua » thai cua, dai cua, hoi cua
lai cua » dai cua, lai chau, thai cua
duc van » duc va, duc tan, duc manh
hieu ve » hieu va, hieu van
nang co » nang cao, nang doc, nang noi
so sach » so sanh, bo sach, co sach
co hoi » co hoc, co loi

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

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