Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
so sach » so sanh, bo sach, co sach
qua cam » qua cham, qua cac, qua ca
truc va » thuc va, trung va
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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

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