Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
te sach » toc sach
va tinh » may tinh
va dinh » van dinh, va kinh, vu dinh
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
vi cua » vai cua, di cua
va cam » va cham, va cac, va cao

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) or (thu sach)) ky tang xa hoi. hieu va cam xuc ((va dinh) OR (va tinh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky tang xa hoi. hieu va cam xuc ((va dinh) OR (va tinh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu sach)) ky tang xa hoi. hieu va cam xuc ((va dinh) OR (va tinh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky tang xa hoi. hieu va cam xuc ((va dinh) OR (va tinh)) vi cua tre*.