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

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

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