Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
lam duoc » nam duoc, luat duoc, lam thuoc
dang xay » dang van, van xay
va hang » van hang, va nang, va lang
duoc va » nuoc va, duc va, duoc ma
van lam » van nam
xay hoi » xa hoi, tay hoi, cay phoi
ty dang » ty xang, ky dang, ty hang
va cua » va chua, via cua, ca cua
co cua » con cua, ca cua, cong cua

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 xay hoi. hieu van lam duoc va hang ((va cua) or (co cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty dang xay hoi. hieu van lam duoc va hang ((va cua) OR (co cua)) tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty dang xay hoi. hieu van lam duoc va hang ((va cua) or (co cua)) tre*.