Perhaps you should try some spelling variations:
ban hanh » ban hang
thuc ban » thuoc ban, thuc dan, thu ban
dau thuc » dan thuc, dai thuc, dam thuc
su sach » so sach, vu sach
cuu tre » cau tren, cau treo
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cua triet, dua tren
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
va dau » va dao

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 ((ty nang) or (ty hang)) xa hoi. lieu va dau thuc ban hanh di ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ty hang)) xa hoi. lieu va dau thuc ban hanh di ((cuu tre) OR (cua tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty nang) or (ty hang)) xa hoi. lieu va dau thuc ban hanh di ((cuu tre) OR (cua tre))*".