Perhaps you should try some spelling variations:
phat thuc » phap thuc, pham thuc, phan thuc
thu sach » tu sach, thuat sach, thuoc sach
day danh » day manh, dai danh, dao danh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
ha manh » ho manh, ha anh, ha thanh
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hieu va phat thuc ((day danh) or (ha manh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu va phat thuc ((day danh) OR (ha manh)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu va phat thuc ((day danh) or (ha manh)) dai cua tre*.