Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
nang xa » nang x, lang xa, nang ma
sang ma » tang ma, nang ma, sang tao
va dinh » van dinh, va kinh, va tinh
hieu va » lieu va, hieu qua
tu bai » tu ban, tu bat, te bai
di cua » dai cua, doi cua, de cua
cua te » cua tu
co luc » coc luc, co luy
bai ky » ban ky, sai ky, bac ky
va co » vo co

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu bai ky ((nang xa) or (sang ma)) hoi. hieu va co luc ((va hanh) or (va dinh)) di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ky ((nang xa) OR (sang ma)) hoi. hieu va co luc ((va hanh) OR (va dinh)) di cua te.
• Adding a wildcard symbol may retrieve word variants: tu bai ky ((nang xa) or (sang ma)) hoi. hieu va co luc ((va hanh) or (va dinh)) di cua te*.