Perhaps you should try some spelling variations:
hang doi » hang di, hang loi, huong doi
hanh di » hanh vi, hanh de, hang di
cao luc » bao luc, cao duc, cao suc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
sach v » sach va, sach y, sach vay
luc va » duc va, tuc va, loc va
sach 2 » sach y
va cao » va cac, va co, va dao
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach v) OR (sach 2)) nang x hoi. hieu va cao luc va ((hanh di) or (hang doi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach v) OR (sach 2)) nang x hoi. hieu va cao luc va ((hanh di) OR (hang doi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach v) OR (sach 2)) nang x hoi. hieu va cao luc va ((hanh di) or (hang doi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach v) OR (sach 2)) nang x hoi. hieu va cao luc va ((hanh di) or (hang doi)) cua tre*.