Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
ban thanh » ban hanh, ban hang
te sach » toc sach
cua tre » cuu tre, cua triet, dua tren
luc ban » duc ban, cuc ban, luc bat
van hac » van hoc, van ha, van hai
sach ly » sach y, sach lo, sach ty
van cac » van cau, van bac, dan cac
ly hang » ly quang
hang o » hang do, hang o2, hoang o
cua te » cua tu
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: te sach ly hang o hoi. hieu ((van cac) OR (van hac)) luc ban thanh doi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly hang o hoi. hieu ((van cac) OR (van hac)) luc ban thanh doi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly hang o hoi. hieu ((van cac) OR (van hac)) luc ban thanh doi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: te sach ly hang o hoi. hieu ((van cac) OR (van hac)) luc ban thanh doi ((cua tre) or (cua te))*.