Perhaps you should try some spelling variations:
nay lang » nam lang, tay lang, nhan lang
lang van » dang van, tang van, hoang van
van hieu » cao hieu
sach nay » sach hay, sach vay, sach nang
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
xuc va » duc va, tuc va, xac va
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach nay lang van hieu. ((hieu ve) OR (hieu qua)) cam ((xuc va) OR (luc va)) hanh vi cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach nay lang van hieu. ((hieu ve) or (hieu qua)) cam ((xuc va) OR (luc va)) hanh vi cua tu~".
• Adding a wildcard symbol may retrieve word variants: su sach nay lang van hieu. ((hieu ve) or (hieu qua)) cam ((xuc va) OR (luc va)) hanh vi cua tu*.