Perhaps you should try some spelling variations:
trong van » trong cac
nhan thuc » nhan luc, dan thuc, toan thuc
duc manh » suc manh, duc anh, duc minh
su sach » so sach, vu sach
cao anh » cao dang, cao tang, cao bang
va nhan » van nhan, ca nhan, va phan
sach va » sach xa, sach ha, sach dao
nang ma » tang ma, sang ma, nang cao
di cua » dai cua, doi cua, de cua
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach va ((nang ma) or (trong van)) hoi. lieu va nhan thuc ((cao anh) or (duc manh)) di cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach va ((nang ma) OR (trong van)) hoi. lieu va nhan thuc ((cao anh) OR (duc manh)) di cua su.
• Adding a wildcard symbol may retrieve word variants: su sach va ((nang ma) or (trong van)) hoi. lieu va nhan thuc ((cao anh) or (duc manh)) di cua su*.