Perhaps you should try some spelling variations:
sach ky » sach ty, sach kem, sach hay
nang xa » nang x, lang xa, nang ma
qua cam » qua cham, qua cac, qua ca
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, tuc xa
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: su ((((sach ky) OR (sach y))) or (sac ky)) nang xa hoi. hieu qua cam tuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((((sach ky) OR (sach y))) OR (sac ky)) nang xa hoi. hieu qua cam tuc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((((sach ky) OR (sach y))) or (sac ky)) nang xa hoi. hieu qua cam tuc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((((sach ky) OR (sach y))) or (sac ky)) nang xa hoi. hieu qua cam tuc va hanh vi cua tre*.