Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
thuc va » thuc vat, thuc dan, thuc day
va nam » van nam, ha nam, va nay
tuc va » truc va, tuc xa, duc va
di va » dai va, doi va, di vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky nang cao hoi. lieu va nam ((tuc va) or (thuc va)) thanh ((di va) OR (di vao)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang cao hoi. lieu va nam ((tuc va) OR (thuc va)) thanh ((di va) OR (di vao)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang cao hoi. lieu va nam ((tuc va) or (thuc va)) thanh ((di va) OR (di vao)) triet".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang cao hoi. lieu va nam ((tuc va) or (thuc va)) thanh ((di va) OR (di vao)) triet*.