Perhaps you should try some spelling variations:
su sach » so sach, vu sach
va kinh » va tinh, qua kinh
va dinh » van dinh, va tinh, vu dinh
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
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: ((su sach) or (te sach)) ky tang xa hoi. hieu ve cau luc ((va dinh) OR (va kinh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky tang xa hoi. hieu ve cau luc ((va dinh) OR (va kinh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (te sach)) ky tang xa hoi. hieu ve cau luc ((va dinh) OR (va kinh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky tang xa hoi. hieu ve cau luc ((va dinh) OR (va kinh)) dai cua tre*.