Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, ban hanh
lang xa » lang ha, dang xay, lang van
nang ma » tang ma, sang ma, nang cao
va danh » va dinh, va dan, dia danh
tu cai » tu cac, tu can, tu bai
di cua » dai cua, doi cua, de cua
qua co » qua con, cua co, qua ca
co luc » coc luc, co luy
cai ky » cao ky, cac ky, cam ky
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: tu cai ky ((lang xa) or (nang ma)) hoi. hieu qua co luc ((va hanh) or (va danh)) di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cai ky ((lang xa) OR (nang ma)) hoi. hieu qua co luc ((va hanh) OR (va danh)) di cua te.
• Adding a wildcard symbol may retrieve word variants: tu cai ky ((lang xa) or (nang ma)) hoi. hieu qua co luc ((va hanh) or (va danh)) di cua te*.