Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
tu sach » su sach, te sach, tu cach
vai cua » dai cua, hai cua, lai cua
dan vai » dan va, dan tai, dan vat
van cam » van nam, van lam, van cau
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau

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: ((tu sach) OR (thu sach)) ((ky lang) OR (ky dang)) xa hoi. hieu van cam xuc va dan vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ((ky lang) or (ky dang)) xa hoi. hieu van cam xuc va dan vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ((ky lang) or (ky dang)) xa hoi. hieu van cam xuc va dan vai cua tre*.