Perhaps you should try some spelling variations:
sach tham » sach nha
chua tre » chua tri, cua tre, chua trieu
lam duoc » nam duoc, luat duoc, lam thuoc
sach thu » sach thue, sach thieu, cach thuc
hieu van » thien van, lieu va, hieu ve
dang xay » dang van, van xay
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
duoc va » nuoc va, duc va, duoc ma
va hang » van hang, va nang, va lang
va chua » vua chua, ca chua, va chu

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