Perhaps you should try some spelling variations:
thuc dan » thuc hanh, thuc vat
ky dang » ky nang, ky danh
dang ma » dang mau, dang mam, dang mat
vu san » va san, vu ban
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu
le nam » ly nam, he nam, le na
san ky » sang ky, van ky, dan ky
va nam » van nam, ha nam, va nay
ma hoi » mai hoi, xa hoi, ma hoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu san ky dang ma hoi. hieu ((va nam) OR (le nam)) ((thuc dan) OR (hoc dan)) hanh vi cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu san ky dang ma hoi. hieu ((va nam) or (le nam)) ((thuc dan) OR (hoc dan)) hanh vi cua tu~".
• Adding a wildcard symbol may retrieve word variants: vu san ky dang ma hoi. hieu ((va nam) or (le nam)) ((thuc dan) OR (hoc dan)) hanh vi cua tu*.