Perhaps you should try some spelling variations:
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
qua hoc » cua hoc, quang hoc, qua hoat
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
tu cai » tu can, tu bai, tu cay
co cua » con cua, ca cua, cong cua
cua tu » cua tuc, cua su, cua cu
nuoc » quoc, duoc, ngoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cai) or (tu cac)) ky tang xa hoi. hieu qua hoc nuoc ((va danh) or (va hanh)) co cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cai) OR (tu cac)) ky tang xa hoi. hieu qua hoc nuoc ((va danh) OR (va hanh)) co cua tu.
• Adding a wildcard symbol may retrieve word variants: ((tu cai) or (tu cac)) ky tang xa hoi. hieu qua hoc nuoc ((va danh) or (va hanh)) co cua tu*.