Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cao truc » cau truc, vao truc, cao thuoc
tai cua » thai cua, tai cuc, tri cua
dan tai » van tai, dan thi, han tai
truc va » thuc va, thuc vat, trung va
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
va cao » va cac, va co, va dao
va dan » ca dan, va dao, va dau
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ((ky tang) or (ky dang)) xa hoi. lieu va cao truc va dan tai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((ky tang) OR (ky dang)) xa hoi. lieu va cao truc va dan tai cua su.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ((ky tang) or (ky dang)) xa hoi. lieu va cao truc va dan tai cua su*.