Perhaps you should try some spelling variations:
hang tai » hang va, dung tai
cham xuc » cam xuc, chat xuc, cham soc
su sach » so sach, vu sach
nang xa » lang xa, nang ma, mang xa
va hang » van hang, va nang, va lang
hieu ve » hieu van
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
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: su sach ky ((nang xa) or (nang x)) hoi. ((hieu ve) OR (hieu va)) cham xuc va hang tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (nang x)) hoi. ((hieu ve) OR (hieu va)) cham xuc va hang tai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) or (nang x)) hoi. ((hieu ve) OR (hieu va)) cham xuc va hang tai va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (nang x)) hoi. ((hieu ve) OR (hieu va)) cham xuc va hang tai va thiet*.