Perhaps you should try some spelling variations:
nhan thuc » nhan luc, dan thuc, toan thuc
doc sach » toc sach, nuoc sach, dac sac
hoc sach » hoc sinh, hoc cac
dan tren » dat tren, dau tren, van tren
tren cua » trien cua, tien cua, tren ca
hoc anh » hoc nganh, hoc nhanh, ngoc anh
nang xa » nang x, lang xa, nang ma
va nhan » van nhan, ca nhan, va phan
thuc ca » thuc cua, thuc can, thuc cao
cua tre » cua te, cuu tre, cua triet
ca dan » cac dan, ca dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc sach) or (((hoc sach) OR (hoc anh)))) ky nang xa hoi. lieu va nhan thuc ca dan tren cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (((hoc sach) OR (hoc anh)))) ky nang xa hoi. lieu va nhan thuc ca dan tren cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc sach) or (((hoc sach) OR (hoc anh)))) ky nang xa hoi. lieu va nhan thuc ca dan tren cua tre*".