Perhaps you should try some spelling variations:
dau truc » cau truc, dai truc, doan truc
sach thu » sach thue, sach thieu, sach tham
truc van » truc va, thuc van, truc ban
hanh di » hanh de, hang di, danh di
cuu tre » cua tre, cau tren, cau treo
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
va dau » va dao

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