Perhaps you should try some spelling variations:
dua tren » dung tren
dinh dat » dinh ket, dinh van, dinh lam
cau phuc » cau truc, chau phu, huu phuc
tu sach » thu sach, su sach, tu cach
vu dinh » quy dinh
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) ky tang xa hoi. hieu ve cau phuc vu dinh dat ((dua tren) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky tang xa hoi. hieu ve cau phuc vu dinh dat ((dua tren) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky tang xa hoi. hieu ve cau phuc vu dinh dat ((dua tren) or (cua tre))*.