Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
xang xa » mang xa, ang xa, dang xay
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
vuc van » luc van, thuc van, chuc van
duc van » duc va, duc tan, duc manh
dinh vi » dinh ve, dinh viet, dinh tri
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: su sach ty ((xang xa) OR (lang xa)) hoi. hieu va cac ((vuc van) or (duc van)) dinh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((xang xa) OR (lang xa)) hoi. hieu va cac ((vuc van) OR (duc van)) dinh vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((xang xa) OR (lang xa)) hoi. hieu va cac ((vuc van) or (duc van)) dinh vi cua tu".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((xang xa) OR (lang xa)) hoi. hieu va cac ((vuc van) or (duc van)) dinh vi cua tu*.