Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
dan thuc » dan toc, am thuc
thuc van » thuc vat, thuc dan, thuc va
thanh di » thanh doi, thanh de, thanh do
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
va dan » ca dan, va dao, va dau

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 ((ly nang) or (ty xang)) xa hoi. lieu va dan thuc van thanh di ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly nang) OR (ty xang)) xa hoi. lieu va dan thuc van thanh di ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly nang) or (ty xang)) xa hoi. lieu va dan thuc van thanh di ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly nang) or (ty xang)) xa hoi. lieu va dan thuc van thanh di ((cuu tre) OR (cua tre))*.