Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thanh ve » hanh ve, thanh va, thanh vien
lang van » dang van, tang van, hoang van
van cau » van dau, van hau, van chat
cua tre » cuu tre, cua triet, dua tren
luc ban » duc ban, cuc ban, luc bat
cau luc » cau truc, cau phuc
tu sach » thu sach, su sach, te sach
van hoi » van hoa, van hoc, van hoe
ky lang » ky nang, ky dang, ky tang
vu sach » vu bach, su sach, vu khach
cua te » cua tu

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