Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van thanh » van tuan
vinh cuu » dinh cuu, sinh cua, dinh cu
cuu tre » cua tre, cau tren, cau treo
cau tuc » cau truc, cau tu, cau luc
sach ly » sach lo, sach ty, sach hay
nang o » nang co, nang ho, nang ro
va cau » van cau, va cac, va dau
o hoi » co hoi, o hoc, o hai

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 ly) or (sach y)) nang o hoi. lieu va cau tuc ((van thanh) OR (ban thanh)) vinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ly) OR (sach y)) nang o hoi. lieu va cau tuc ((van thanh) OR (ban thanh)) vinh cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ly) or (sach y)) nang o hoi. lieu va cau tuc ((van thanh) OR (ban thanh)) vinh cuu tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ly) or (sach y)) nang o hoi. lieu va cau tuc ((van thanh) OR (ban thanh)) vinh cuu tre*.