Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
van hanh » ban hanh, van anh, van ban
dau tuc » dau tu, dao tuc, cau truc
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach thu, xach tay
nang xa » nang x, lang xa, nang ma
sach tu » sach thu, cach tu, sach uu
di cua » dai cua, doi cua, de cua
va dau » va dao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach tu)) nang xa hoi. lieu va dau tuc ((van hanh) OR (van thanh)) di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach tu)) nang xa hoi. lieu va dau tuc ((van hanh) OR (van thanh)) di cua tre~".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach tu)) nang xa hoi. lieu va dau tuc ((van hanh) OR (van thanh)) di cua tre*.