Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hieu cua » hieu qua, dieu cua, bieu cua
tu sach » te sach, tu cach, vu sach
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
hanh le » thanh le, hanh ve, hanh de
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
le cua » ly cua

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) or (thu sach))) or (su sach)) ky nang xa hoi. hieu cua cac tuc va hanh le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (thu sach))) OR (su sach)) ky nang xa hoi. hieu cua cac tuc va hanh le cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) or (thu sach))) or (su sach)) ky nang xa hoi. hieu cua cac tuc va hanh le cua tre*.