Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach thu » sach thue, sach thieu, sach tham
sach tu » cach tu, sach ty, sach uu
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
qua ca » qua cac, qua cua, qua cai
ca duc » cao duc, cua duc, ca dua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach thu) or (sach tu)) nang xa hoi. hieu qua ca duc va hanh vi ((cua triet) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach thu) OR (sach tu)) nang xa hoi. hieu qua ca duc va hanh vi ((cua triet) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: te ((sach thu) or (sach tu)) nang xa hoi. hieu qua ca duc va hanh vi ((cua triet) or (cuu tre))*.