Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
dieu cua » dieu tra
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
cac luc » cau luc, coc luc, cac nuoc
via cua » gia cua, gian cua, giau cua
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau
va cua » va chua, ca cua, ma 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: ((tu sach) OR (thu sach)) y nang xa hoi. dieu cua cac luc va dan ((va cua) OR (via cua)) viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) y nang xa hoi. dieu cua cac luc va dan ((va cua) OR (via cua)) viet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang xa hoi. dieu cua cac luc va dan ((va cua) OR (via cua)) viet*.