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