Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
toc sac » toc sach, toc san, hoc sach
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
sac ky » cac ky, sai ky
ma hoi » mai hoi, ma hoa, me hoi
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky nang ((ma hoi) OR (xa hoi)). hieu ve cam xuc va hanh vi ((cua te) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky nang ((ma hoi) OR (xa hoi)). hieu ve cam xuc va hanh vi ((cua te) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ky nang ((ma hoi) OR (xa hoi)). hieu ve cam xuc va hanh vi ((cua te) or (va trien))".
• Adding a wildcard symbol may retrieve word variants: toc sac ky nang ((ma hoi) OR (xa hoi)). hieu ve cam xuc va hanh vi ((cua te) or (va trien))*.