Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh tri » thanh tri, hanh tai, hanh trinh
co sach » bo sach, cuon sach, hoc sach
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
van bac » van bao, van hac, dan bac
xuc van » duc van, luc van, vuc van
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: co sach ky ((nang xa) OR (nang x)) hoi. thi ((van bac) or (van ban)) xuc van hanh tri cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ky ((nang xa) OR (nang x)) hoi. thi ((van bac) OR (van ban)) xuc van hanh tri cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ky ((nang xa) OR (nang x)) hoi. thi ((van bac) or (van ban)) xuc van hanh tri cua te".
• Adding a wildcard symbol may retrieve word variants: co sach ky ((nang xa) OR (nang x)) hoi. thi ((van bac) or (van ban)) xuc van hanh tri cua te*.