Perhaps you should try some spelling variations:
thu xang » thu hang, thu dang, thu sang
hanh vai » hanh vi, hanh va, hanh tai
thu bang » thu ban, thu hang, chu bang
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
vai cua » dai cua, hai cua, lai cua
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
ac va » tac va, bac va, mac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((thu xang) OR (thu bang)) xa hoi. hieu van cau ((ac va) or (luc va)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((thu xang) OR (thu bang)) xa hoi. hieu van cau ((ac va) OR (luc va)) hanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((thu xang) OR (thu bang)) xa hoi. hieu van cau ((ac va) or (luc va)) hanh vai cua tre*".