Perhaps you should try some spelling variations:
sach thu » sach thue, sach tham, cach thuc
dau truc » cau truc, dai truc, doan truc
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
hanh di » hanh vi, hanh de, hang di
cau tre » cau tren, cau treo, cau tra
va dau » va dao
di cau » da cau, diem cau

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