Perhaps you should try some spelling variations:
dang thai » dang thi, dang hai, dang khai
hoc sach » hoc sinh, hoc cac, hoc anh
thai cua » than cua, tai cuc, tri cua
sach ky » sac ky, sach y, sach ty
van bac » van ban, van bao, dan bac
van hac » van hoc, van ha, van hai
va dang » van dang, va nang, va lang
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky nang x hoi. thi ((van bac) or (van hac)) nuoc va dang thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang x hoi. thi ((van bac) OR (van hac)) nuoc va dang thai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang x hoi. thi ((van bac) or (van hac)) nuoc va dang thai cua tre*.