Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
thanh ve » hanh ve, thanh va, thanh vien
va thanh » gia thanh, ban thanh, va tinh
cac thuc » cac thu, can thuc, cay thuc
so sach » bo sach, co sach, hoc sach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
so sanh » do sanh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ve cua » le cua, de cua, te 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) or (so sanh)) y nang xa hoi. hieu va ((cac thuc) OR (cach thuc)) va thanh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) y nang xa hoi. hieu va ((cac thuc) OR (cach thuc)) va thanh ve cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (so sanh)) y nang xa hoi. hieu va ((cac thuc) OR (cach thuc)) va thanh ve cua tre".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) y nang xa hoi. hieu va ((cac thuc) OR (cach thuc)) va thanh ve cua tre*.