Perhaps you should try some spelling variations:
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
cao suc » cao su, cao duc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ve cao » va cao, ve bao, ve cac
suc va » duc va, tuc va, luc va
sac ky » cac ky, sai ky
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 y) or (sac ky)) nang x hoi. hieu ve cao suc va ((hanh di) OR (hanh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach y) OR (sac ky)) nang x hoi. hieu ve cao suc va ((hanh di) OR (hanh de)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach y) or (sac ky)) nang x hoi. hieu ve cao suc va ((hanh di) OR (hanh de)) cua tre*".