Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va cham » va chat
va tham » van tham, va thanh, va thuat
hang di » hang doi, hang vi, hang dien
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
goc va » hoc va, doc va, uoc va
loc va » hoc va, luc va
di cua » dai cua, doi cua, de cua
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 nang x hoi. lieu ((va cham) OR (va tham)) ((goc va) or (loc va)) hang di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. lieu ((va cham) OR (va tham)) ((goc va) OR (loc va)) hang di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x hoi. lieu ((va cham) OR (va tham)) ((goc va) or (loc va)) hang di cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. lieu ((va cham) OR (va tham)) ((goc va) or (loc va)) hang di cua tre*.