Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
thanh de » hanh de, thanh ve, thanh do
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
dang cay » dang xay, dang ca, dang cac
cay phoi » cap phoi, tay hoi, cay cho
hieu va » lieu va, hieu qua
lam luc » lao luc, lam duoc
ty dang » ty xang, ky dang, ty hang
luc va » duc va, tuc va, loc va
de cua » le cua, te cua, dieu 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: ((te sach) or (toc sach)) ty dang cay phoi. ((hieu van) or (hieu va)) lam luc va thanh de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty dang cay phoi. ((hieu van) OR (hieu va)) lam luc va thanh de cua te.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty dang cay phoi. ((hieu van) or (hieu va)) lam luc va thanh de cua te*.