Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
van lam » van nam
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
loc va » luc va
cua tu » cua tuc, cua su, cua cu

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) or (vu bach)) ky lang xa hoi. hieu van lam ((loc va) OR (hoc va)) hanh vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu bach)) ky lang xa hoi. hieu van lam ((loc va) OR (hoc va)) hanh vai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu bach)) ky lang xa hoi. hieu van lam ((loc va) OR (hoc va)) hanh vai cua tu".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu bach)) ky lang xa hoi. hieu van lam ((loc va) OR (hoc va)) hanh vai cua tu*.