Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hang doi » hang di, hang loi, huong doi
cao suc » cao su, cao duc
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
cao luc » bao luc, cao duc, cau luc
hieu va » lieu va, hieu qua
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
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 nang x hoi. hieu va ((cao luc) OR (cao suc)) va ((hanh di) or (hang doi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach v nang x hoi. hieu va ((cao luc) OR (cao suc)) va ((hanh di) OR (hang doi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach v nang x hoi. hieu va ((cao luc) OR (cao suc)) va ((hanh di) or (hang doi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach v nang x hoi. hieu va ((cao luc) OR (cao suc)) va ((hanh di) or (hang doi)) cua tre*.