Perhaps you should try some spelling variations:
cach thuc » anh thuc
thanh vi » hanh vi, thanh va, thanh ve
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
cac thu » cac thoi
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang xa hoi. ((hieu va) or (lieu va)) ((cach thuc) OR (cac thu)) gia thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang xa hoi. ((hieu va) OR (lieu va)) ((cach thuc) OR (cac thu)) gia thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang xa hoi. ((hieu va) or (lieu va)) ((cach thuc) OR (cac thu)) gia thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach y nang xa hoi. ((hieu va) or (lieu va)) ((cach thuc) OR (cac thu)) gia thanh vi cua tre*.