Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
vien cac » vien bach, vien dai, vien da
hieu luc » hieu luat, hieu qua
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky nang xa hoi. ((vien cac) or (hieu luc)) cau truc ((va tinh) or (va dan)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang xa hoi. ((vien cac) OR (hieu luc)) cau truc ((va tinh) OR (va dan)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang xa hoi. ((vien cac) or (hieu luc)) cau truc ((va tinh) or (va dan)) dai cua tre*.