Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
dau tuc » dau tu, dao tuc, cau truc
tuc van » thuc van, truc van, tuc va
hanh de » hanh ve, hanh kem
cua tre » cua te, cuu tre, cua triet
va dau » va dao
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach ty) or (sach thu)) nang xa hoi. lieu va dau tuc van hanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ty) OR (sach thu)) nang xa hoi. lieu va dau tuc van hanh de cua tre*.