Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
dau thuc » dan thuc, dai thuc, dam thuc
thuc van » thuc vat, thuc dan, thuc va
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
va dau » va dao
di cuu » di cau, dinh cuu
di cua » dai cua, doi cua, de cua

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 dau thuc van thanh ((di cuu) OR (di 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 dau thuc van thanh ((di cuu) OR (di 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 dau thuc van thanh ((di cuu) OR (di cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly nang) or (ty xang)) xa hoi. lieu va dau thuc van thanh ((di cuu) OR (di cua)) tre*.