Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
va chat » van chat, va phat, cao chat
cao hoc » co hoc, cho hoc, chat hoc
sach v » sach va, sach y, sach 2
va cao » va cac, va co, va dao
v nang » va nang, vu nang, van nang

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 v nang cao hoc. lieu ((va cao) or (va chat)) thuc va hanh ((va su) or (ve su)) tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang cao hoc. lieu ((va cao) OR (va chat)) thuc va hanh ((va su) OR (ve su)) tien.
• Adding a wildcard symbol may retrieve word variants: tu sach v nang cao hoc. lieu ((va cao) or (va chat)) thuc va hanh ((va su) or (ve su)) tien*.