Perhaps you should try some spelling variations:
lang dai » lang hai, lang mai, lang chai
thanh do » thanh pho, thanh hoa, thanh loi
thanh de » hanh de, thanh ve, thanh le
te sach » toc sach
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
y lang » o lang, _ lang, tay lang
ve cac » va cac, vien cac
dac va » day va, dat va, dai va

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 y lang dai hoi. hieu ve cac ((dac va) OR (duc va)) ((thanh de) or (thanh do)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y lang dai hoi. hieu ve cac ((dac va) OR (duc va)) ((thanh de) OR (thanh do)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y lang dai hoi. hieu ve cac ((dac va) OR (duc va)) ((thanh de) or (thanh do)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach y lang dai hoi. hieu ve cac ((dac va) OR (duc va)) ((thanh de) or (thanh do)) cuu tre*.