Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
pham duy » pham duc
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
tu sach » su sach, te sach, tu cach
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) OR (tu sach)) ly 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) OR (tu sach)) ly 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) OR (tu sach)) ly nang xa hoi. hieu va pham duy va hanh ((vi cua) or (vai cua)) te*.