Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cam » van nam, van lam, van cau
sach ky » sac ky, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, luc va
loc va » hoc va, luc va
vi cua » vai cua, di cua
cua te » cua tu

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