Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, tu cach
te sach » toc sach
cao hoc » co hoc, cho hoc, chat hoc
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
su tien » su kien, su hien, tu tieng
y nang » ky nang, ly nang, v nang
va am » va lam, va cam
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) y nang cao hoc. lieu va am thuc va hanh vi su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang cao hoc. lieu va am thuc va hanh vi su tien.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) y nang cao hoc. lieu va am thuc va hanh vi su tien*.