Perhaps you should try some spelling variations:
thanh te » thanh ve, thanh le, thanh tu
thanh de » hanh de, thanh ve, thanh do
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
va cham » va tham
va chat » van chat, va phat, cao chat
cua tre » cua te, cuu tre, cua triet

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 ky nang cao hoi. lieu ((va cham) or (va chat)) tuc xa ((thanh te) OR (thanh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang cao hoi. lieu ((va cham) OR (va chat)) tuc xa ((thanh te) OR (thanh de)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang cao hoi. lieu ((va cham) or (va chat)) tuc xa ((thanh te) OR (thanh de)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang cao hoi. lieu ((va cham) or (va chat)) tuc xa ((thanh te) OR (thanh de)) cua tre*.