Perhaps you should try some spelling variations:
cham xuc » cam xuc, chat xuc, cham soc
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
va cham » va chat, va tham
sach ty » sach tu, sach thu, xach tay
va hanh » van hanh, va thanh, va danh
voi dan » hoi dan, doi dan, loi dan
voi can » voi cac, voi cong, voi hang
xuc va » duc va, tuc va, luc va

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 ty) or (sach y)) nang cao hoi. hieu va cham xuc va hanh ((voi dan) OR (voi can)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang cao hoi. hieu va cham xuc va hanh ((voi dan) OR (voi can)) thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach y)) nang cao hoi. hieu va cham xuc va hanh ((voi dan) OR (voi can)) thiet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) nang cao hoi. hieu va cham xuc va hanh ((voi dan) OR (voi can)) thiet*.