Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
dan vat » dang vat, van vat, dan va
den vai » den va, den vay, den vi
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hieu va cac ((xuc va) or (luc va)) ((den vai) or (dan vat)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu va cac ((xuc va) OR (luc va)) ((den vai) OR (dan vat)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu va cac ((xuc va) or (luc va)) ((den vai) or (dan vat)) cua tre*.