Perhaps you should try some spelling variations:
pham duy » pham duc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va hanh » van hanh, va thanh, va danh
bai cua » ban cua, bai ca, hai cua
duy va » duy vat, duy van, day va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang x hoi. hieu ve pham duy va hanh ((bai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ve pham duy va hanh ((bai cua) OR (dai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ve pham duy va hanh ((bai cua) or (dai cua)) tre*.