Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
xa thanh » va thanh, ha thanh, ta thanh
su sach » so sach, vu sach
nam tuc » nam thuc, nam truc, nam tu
va hanh » van hanh, va thanh, va danh
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
y nang » ky nang, ly nang, v nang
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 y nang x hoi. hieu van nam tuc ((va hanh) or (xa thanh)) vai ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. hieu van nam tuc ((va hanh) OR (xa thanh)) vai ((cuu tre) OR (cua tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x hoi. hieu van nam tuc ((va hanh) or (xa thanh)) vai ((cuu tre) OR (cua tre))*".