Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
dang cay » dang xay, dang ca, dang cac
cay phoi » cap phoi, tay hoi, cay cho
hanh te » hanh tu, hanh ve, hanh de
van lam » van nam
ty dang » ty xang, ky dang, ty hang
luc va » duc va, tuc va
loc va » hoc va
te cua » tue cua, le cua, de cua
cua te » cua tu

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: ((te sach) OR (toc sach)) ty dang cay phoi. hieu van lam ((luc va) OR (loc va)) hanh te cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ty dang cay phoi. hieu van lam ((luc va) OR (loc va)) hanh te cua te~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty dang cay phoi. hieu van lam ((luc va) OR (loc va)) hanh te cua te*.