Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
thanh vi » hanh vi, thanh va, thanh ve
tay lang » tai lang, tay tang, tay quang
duc gia » quoc gia
te sach » toc sach
ty lang » ty xang, ty hang, tu lang
van hoi » van hoa, van hoc, van hoe
va cao » va cac, va co, va dao
vi dau » vi dai, va dau, bi dau

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 ((ty lang) OR (tay lang)) van hoi. hieu ((va cao) or (te bao)) duc gia thanh vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty lang) OR (tay lang)) van hoi. hieu ((va cao) OR (te bao)) duc gia thanh vi dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty lang) OR (tay lang)) van hoi. hieu ((va cao) or (te bao)) duc gia thanh vi dau tren".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty lang) OR (tay lang)) van hoi. hieu ((va cao) or (te bao)) duc gia thanh vi dau tren*.