Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh ve » hanh ve, thanh va, thanh vien
dang xay » dang van, van xay
van cau » van dau, van chat, toan cau
luc ban » duc ban, cuc ban, luc bat
van hau » van ha, van hai, van dau
tu sach » thu sach, su sach, te sach
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
vu sach » vu bach, su sach, vu khach
cuu tre » cua tre, cau tren, cau treo
ve cuu » ve cau, ve chu, ve cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (vu sach)) ky dang xay hoi. hieu ((van cau) OR (van hau)) luc ban thanh ve cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ky dang xay hoi. hieu ((van cau) OR (van hau)) luc ban thanh ve cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (vu sach)) ky dang xay hoi. hieu ((van cau) OR (van hau)) luc ban thanh ve cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky dang xay hoi. hieu ((van cau) OR (van hau)) luc ban thanh ve cuu tre*.