Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
vinh cua » sinh cua, tinh cua, dinh cua
sach ky » sac ky, sach ty, sach kem
qua cam » qua cham, qua cac, qua ca
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) OR (sach y)) nang x hoi. hieu qua cam xuc ((va hanh) or (ban thanh)) vinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) nang x hoi. hieu qua cam xuc ((va hanh) OR (ban thanh)) vinh cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach y)) nang x hoi. hieu qua cam xuc ((va hanh) or (ban thanh)) vinh cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach y)) nang x hoi. hieu qua cam xuc ((va hanh) or (ban thanh)) vinh cua tre*.