Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hang tai » hang va, dung tai
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
suc va » tuc va, luc va, soc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ky lang) or (ky tang)) xa hoi. lieu va cao ((suc va) OR (duc va)) hang tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky lang) OR (ky tang)) xa hoi. lieu va cao ((suc va) OR (duc va)) hang tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky lang) or (ky tang)) xa hoi. lieu va cao ((suc va) OR (duc va)) hang tai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky lang) or (ky tang)) xa hoi. lieu va cao ((suc va) OR (duc va)) hang tai cua tre*.