Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hang tai » hang va, dung tai
su sach » so sach, vu sach
tai duc » tai cuc, mai duc, tai du
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
duc tre » duoc tren, duc tien
luc va » duc va, tuc va
loc va » hoc va

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 ky dang xa hoi. ((hieu ve) OR (hieu van)) cau ((luc va) or (loc va)) hang tai duc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xa hoi. ((hieu ve) OR (hieu van)) cau ((luc va) OR (loc va)) hang tai duc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang xa hoi. ((hieu ve) OR (hieu van)) cau ((luc va) or (loc va)) hang tai duc tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xa hoi. ((hieu ve) OR (hieu van)) cau ((luc va) or (loc va)) hang tai duc tre*.