Perhaps you should try some spelling variations:
hang dong » hang nong, hang cong, hanh dong
thuc van » thuc vat, thuc dan, thuc hanh
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
va nang » van nang, da nang, kha nang
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
dong su » dang su, dong tu, dong luc
x hoi » xa hoi, o hoi, x ho

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 ((va nang) OR (cam nang)) x hoi. hieu va cac ((thuc van) or (thuc va)) hang dong su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((va nang) OR (cam nang)) x hoi. hieu va cac ((thuc van) OR (thuc va)) hang dong su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((va nang) OR (cam nang)) x hoi. hieu va cac ((thuc van) or (thuc va)) hang dong su triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((va nang) OR (cam nang)) x hoi. hieu va cac ((thuc van) or (thuc va)) hang dong su triet*.