Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
thanh vi » hanh vi, thanh va, thanh ve
su sach » so sach, vu sach
dang xa » dang xay, lang xa, dang ha
y dang » ky dang, 2 dang, _ dang
xuc va » tuc va, luc va, xac va
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 y dang xa hoi. ((hieu van) OR (thien van)) cau ((xuc va) or (duc va)) thanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y dang xa hoi. ((hieu van) OR (thien van)) cau ((xuc va) OR (duc va)) thanh vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y dang xa hoi. ((hieu van) OR (thien van)) cau ((xuc va) or (duc va)) thanh vi cua tu".
• Adding a wildcard symbol may retrieve word variants: su sach y dang xa hoi. ((hieu van) OR (thien van)) cau ((xuc va) or (duc va)) thanh vi cua tu*.