Perhaps you should try some spelling variations:
quang ban » quang binh, quang tuan, quang tran
thanh vai » thanh hai, thanh van, thanh tai
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
quan ban » qua ban, quan van, luan ban
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang

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 ((xa hoi) or (ma hoa)). hieu van nam ((quan ban) OR (quang ban)) thanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ((xa hoi) OR (ma hoa)). hieu van nam ((quan ban) OR (quang ban)) thanh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang ((xa hoi) or (ma hoa)). hieu van nam ((quan ban) OR (quang ban)) thanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((xa hoi) or (ma hoa)). hieu van nam ((quan ban) OR (quang ban)) thanh vai cuu tre*.