Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
tay tang » tay lang, tay trung, tay quang
nay tang » nam tang, anai tang, nham tang
qua cam » qua cham, qua cac, qua ca
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
so sach » so sanh, bo sach, co sach
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, tuc va, loc va

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 ((nay tang) OR (tay tang)) ma hoi. hieu qua cam luc va hanh vi ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((nay tang) OR (tay tang)) ma hoi. hieu qua cam luc va hanh vi ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((nay tang) OR (tay tang)) ma hoi. hieu qua cam luc va hanh vi ((cua triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: so sach ((nay tang) OR (tay tang)) ma hoi. hieu qua cam luc va hanh vi ((cua triet) or (cua viet))*.