Perhaps you should try some spelling variations:
sach thuc » cach thuc, sach thu, sach thue
hanh xay » hanh may, manh xay, anh xay
hieu van » hieu va, thien van, lieu va
duoc ma » duoc lam
ca chua » ca cua, sua chua
va chua » vua chua, va chu, a chua
te sach » toc sach
duoc va » nuoc va, duc va, duong va
van lam » van nam
xay hoi » xa hoi, tay hoi, cay phoi

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 thuc hanh xay hoi. hieu van lam ((duoc va) or (duoc ma)) hang ((va chua) OR (ca chua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thuc hanh xay hoi. hieu van lam ((duoc va) OR (duoc ma)) hang ((va chua) OR (ca chua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thuc hanh xay hoi. hieu van lam ((duoc va) or (duoc ma)) hang ((va chua) OR (ca chua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach thuc hanh xay hoi. hieu van lam ((duoc va) or (duoc ma)) hang ((va chua) OR (ca chua)) tre*.