Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
pham duy » pham duc
ly nang » ly hang, ly vang, ly quang
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
duy va » duy vat, duy van, day va
vi cua » di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ly nang) OR (ky nang)) xa hoi. hieu va pham duy va hanh ((vi cua) OR (vai cua)) te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ly nang) OR (ky nang)) xa hoi. hieu va pham duy va hanh ((vi cua) or (vai cua)) te~".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ly nang) OR (ky nang)) xa hoi. hieu va pham duy va hanh ((vi cua) or (vai cua)) te*.