Perhaps you should try some spelling variations:
dan khai » dang khai, van khai, dang khoi
khai cua » thai cua, hai cua, khi cua
cua viet » ca viet, hoa viet, cua vat
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
van hac » van ha, van hai, van chat
van hoc » van hoa
thuc va » thuc vat, thuc dan, thuc day
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach tu nang xa hoi. hieu ((van hac) or (van hoc)) thuc va dan khai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nang xa hoi. hieu ((van hac) OR (van hoc)) thuc va dan khai cua viet.
• Adding a wildcard symbol may retrieve word variants: te sach tu nang xa hoi. hieu ((van hac) or (van hoc)) thuc va dan khai cua viet*.