Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
cham xuc » cam xuc, chat xuc, cham soc
cao hoi » cau hoi, co hoi, cao hoc
sach ty » sach tu, sach thu, xach tay
va hanh » van hanh, va thanh, va danh
doi dan » doi ban, doi dau, do dan
hoi dan » hoa dan, hoc dan, hoi dap
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 qua cham xuc va hanh ((doi dan) OR (hoi dan)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang cao hoi. hieu qua cham xuc va hanh ((doi dan) OR (hoi dan)) thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach y)) nang cao hoi. hieu qua cham xuc va hanh ((doi dan) OR (hoi dan)) thiet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) nang cao hoi. hieu qua cham xuc va hanh ((doi dan) OR (hoi dan)) thiet*.