Perhaps you should try some spelling variations:
dang xay » dang van, van xay
cham xuc » cam xuc, chat xuc, pham duc
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
lang xa » lang ha, lang van
han mai » han tai, ban mai, han mac
va han » va phan, van han, va hanh
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) OR (cham soc)) va han mai 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) OR (cham soc)) va han mai 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) OR (cham soc)) va han mai va thiet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang xa) or (dang xay)) hoi. hieu van ((cham xuc) OR (cham soc)) va han mai va thiet*.