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