Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach ty » sach tu, sach thu, xach tay
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua
cac tu » cac thu, cach tu, cac du
tu van » tu va
vi cua » vai cua, di cua
cua te » cua tu

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) OR (sach y)) mang xa hoi. hieu va cac tu van hanh vi cua te~".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) OR (sach y)) mang xa hoi. hieu va cac tu van hanh vi cua te*.