Perhaps you should try some spelling variations:
nhan thuc » nhan luc, dan thuc, toan thuc
thu sach » thuat sach, thuoc sach, thu hoach
hieu cao » chieu cao, hieu cac, hieu ca
cao nhan » ca nhan, tao nhan, cam nhan
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
tu sach » su sach, te sach, tu cach
va danh » va dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh
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) OR (tu sach)) ty nang xa hoi. hieu cao nhan thuc ((va danh) or (va dinh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ty nang xa hoi. hieu cao nhan thuc ((va danh) OR (va dinh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) ty nang xa hoi. hieu cao nhan thuc ((va danh) or (va dinh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) ty nang xa hoi. hieu cao nhan thuc ((va danh) or (va dinh)) dai cua tre*.