Perhaps you should try some spelling variations:
thien bang » khien bang, thien ban, thien dang
dung tren » dung trong, dung trung
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
su sach » vu sach
lam xuc » cam xuc, lam duoc
qua lam » cua lam, qua la, qua lao
bang xa » lang xa, bang va, mang xa
so sach » so sanh, bo sach, co sach
cuu tre » cua tre, cau tren, cau treo
xuc va » duc va, tuc va, luc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (so sach)) thien bang xa hoi. hieu qua lam xuc va thanh vi ((dung tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) thien bang xa hoi. hieu qua lam xuc va thanh vi ((dung tren) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) thien bang xa hoi. hieu qua lam xuc va thanh vi ((dung tren) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) thien bang xa hoi. hieu qua lam xuc va thanh vi ((dung tren) or (cuu tre))*.