Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
hanh vai » hanh va, hanh tai, hanh van
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
duc ban » duc tan, duc van, dua ban
ma hoi » mai hoi, xa hoi, me hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ((ma hoi) or (ma hoa)). hieu ve cham duc ban ((hanh vai) OR (hanh vi)) hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((ma hoi) OR (ma hoa)). hieu ve cham duc ban ((hanh vai) OR (hanh vi)) hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((ma hoi) or (ma hoa)). hieu ve cham duc ban ((hanh vai) OR (hanh vi)) hoa viet".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((ma hoi) or (ma hoa)). hieu ve cham duc ban ((hanh vai) OR (hanh vi)) hoa viet*.