Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
dang xay » dang van, van xay
han tai » hang tai, nhan tai, van tai
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
lang xa » lang ha, lang van
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
tai va » thai va, mai va, tri va
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((lang xa) or (dang xay)) hoi. hieu van cham ((xuc va) OR (luc va)) han tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang xa) OR (dang xay)) hoi. hieu van cham ((xuc va) OR (luc va)) han tai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((lang xa) or (dang xay)) hoi. hieu van cham ((xuc va) OR (luc va)) han tai va thiet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang xa) or (dang xay)) hoi. hieu van cham ((xuc va) OR (luc va)) han tai va thiet*.