Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
sach tu » sach thu, cach tu, sach ty
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
tu sach » thu sach, su sach, te sach
hieu va » lieu va
luc va » duc va, tuc va, loc va
ang xa » lang xa, mang xa, dang xay
tu ang » tu lang, tu anc, tu anh

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

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