Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
vai cua » dai cua, hai cua, lai cua
vi cua » di cua

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 xang xa hoi. hieu va cac ((luc van) or (duc van)) dinh ((vi cua) or (vai cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty xang xa hoi. hieu va cac ((luc van) OR (duc van)) dinh ((vi cua) OR (vai cua)) tu.
• Adding a wildcard symbol may retrieve word variants: su sach ty xang xa hoi. hieu va cac ((luc van) or (duc van)) dinh ((vi cua) or (vai cua)) tu*.