Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cau tren » cu tren, dau tren, ca tren
thanh vi » hanh vi, thanh va, thanh ve
van hau » van ha, van hai, van dau
hoc ban » hoc bang, hoc dan, hoc bai
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
van cau » van dau, van chat, toan cau
lang ha » long ha
ty lang » tay lang, ty xang, ty hang
ha hoi » hoa hoi, ha noi, xa hoi
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty lang ha hoi. hieu ((((van cau) OR (van hau))) or (van nam)) hoc ban thanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty lang ha hoi. hieu ((((van cau) OR (van hau))) OR (van nam)) hoc ban thanh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty lang ha hoi. hieu ((((van cau) OR (van hau))) or (van nam)) hoc ban thanh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: su sach ty lang ha hoi. hieu ((((van cau) OR (van hau))) or (van nam)) hoc ban thanh vi cau tren*.