Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
co sach » bo sach, cuon sach, hoc sach
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu van
hieu va » lieu va, hieu qua
cao luc » bao luc, cao duc, cao suc
luc van » luoc van, luu van, duc van
y xang » ty xang
vi cua » vai cua, di cua
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: co sach y xang xa hoi. ((hieu ve) or (hieu va)) cao luc van hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach y xang xa hoi. ((hieu ve) OR (hieu va)) cao luc van hanh vi cua tu.
• Adding a wildcard symbol may retrieve word variants: co sach y xang xa hoi. ((hieu ve) or (hieu va)) cao luc van hanh vi cua tu*.