Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
cau thu » cau thi, cau tu, cac thu
sach ky » sac ky, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
van cau » van dau, van hau, van chat
ma hoi » mai hoi, xa hoi, ma hoa
thu va » thuc va, thue va, tu va

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 ky) or (sach y)) nang ma hoi. hieu van cau thu va hanh vi ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang ma hoi. hieu van cau thu va hanh vi ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang ma hoi. hieu van cau thu va hanh vi ((cua tre) or (su triet))*.