Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh di » hanh vi, hanh de, hang di
sach ky » sac ky, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
xac va » tac va, ac va, bac va
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de 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 nam ((xac va) or (luc va)) hanh di 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 nam ((xac va) OR (luc va)) hanh di cua te.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang ma hoi. hieu van nam ((xac va) or (luc va)) hanh di cua te*.