Perhaps you should try some spelling variations:
trong van » trong cac
nham thuc » nhan thuc, nam thuc, nham thu
duc manh » suc manh, duc anh, duc minh
va nham » va cham, va tham, va nha
su sach » so sach, vu sach
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 nham thuc ((cao dang) 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 nham thuc ((cao dang) 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 nham thuc ((cao dang) or (duc manh)) di cua su*.