Perhaps you should try some spelling variations:
dat khanh » van khanh, duy khanh
xa khanh » xa thanh, van khanh, hoa khanh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
va nam » van nam, ha nam, va nay
ma hoi » mai hoi, ma hoa, me hoi
vi cua » vai cua, di cua
nam tu » nam thu, nam thuc

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: te sach ky nang ((ma hoi) OR (xa hoi)). hieu va nam tu ((xa khanh) OR (dat khanh)) vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((ma hoi) OR (xa hoi)). hieu va nam tu ((xa khanh) or (dat khanh)) vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((ma hoi) OR (xa hoi)). hieu va nam tu ((xa khanh) or (dat khanh)) vi cua tre*.