Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
va triet » va thiet, va trien, ve triet
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
hieu ha » hieu hoa, hieu va, hieu ca
nam tuc » nam thuc, nam truc, nam tu
xa hanh » xa thanh, xa khanh, va hanh
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet

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)) ky nang xa hoi. hieu ha nam tuc xa hanh va ((cua tre) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky nang xa hoi. hieu ha nam tuc xa hanh va ((cua tre) or (va triet))~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky nang xa hoi. hieu ha nam tuc xa hanh va ((cua tre) or (va triet))*.