Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh lap » thanh san, phan lap, thanh hai
van cham » van chat, van tham, va cham
cham luc » cham soc, nhan luc, cham cuu
dua tren » dung tren
hieu van » hieu va, thien van, lieu va
luc ban » duc ban, cuc ban, luc bat
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
tao hoi » tao khoi, tay hoi, thao hoc
ty sang » ty xang, ty hang, duy sang
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 ty sang ((tao hoi) OR (tao boi)). hieu van cham luc ban thanh lap ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty sang ((tao hoi) OR (tao boi)). hieu van cham luc ban thanh lap ((dua tren) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty sang ((tao hoi) OR (tao boi)). hieu van cham luc ban thanh lap ((dua tren) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty sang ((tao hoi) OR (tao boi)). hieu van cham luc ban thanh lap ((dua tren) or (cua te))*.