Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
cau luc » cau phuc
xang xa » lang xa, mang xa, ang xa

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