Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
co sach » bo sach, cuon sach, hoc sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua
lap doc » lap doi, lap dong, phap doc
vi cua » vai cua, di cua
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 dang xa hoi. hieu va ((lap loc) OR (lap doc)) van hanh vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ky dang xa hoi. hieu va ((lap loc) OR (lap doc)) van hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: co sach ky dang xa hoi. hieu va ((lap loc) OR (lap doc)) van hanh vi cua te*.