Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
cua tre » cua te, cua triet, dua tren
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
tu sach » su sach, te sach, tu cach
cuu tre » cau tren, cau treo

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

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