Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
pham cuu » pham huu, cham cuu, pham cua
thu bang » thu ban, thu hang, thu trang
thanh vi » thanh va, thanh ve, nhanh vi
chu bang » chuc nang, chu quang, chu trang
cuu ban » cuu van, cua ban, cuu san
va pham » van pham, va phat, va phap
cau tre » cau tren, cau treo, cau tra

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((thu bang) OR (chu bang)) xa hoi. lieu va pham cuu ban ((thanh vi) or (hanh vi)) cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((thu bang) OR (chu bang)) xa hoi. lieu va pham cuu ban ((thanh vi) OR (hanh vi)) cau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((thu bang) OR (chu bang)) xa hoi. lieu va pham cuu ban ((thanh vi) or (hanh vi)) cau tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((thu bang) OR (chu bang)) xa hoi. lieu va pham cuu ban ((thanh vi) or (hanh vi)) cau tre*.