Perhaps you should try some spelling variations:
van triet » va triet, van thiet, van trieu
thanh hai » thanh phan, thanh hoa, thanh san
dan thanh » dang thanh, danh thanh, ban thanh
thuc dan » thuc hanh, hoc dan, thuc vat
va cham » va chat, va tham
hai van » thai van, ha van, hai tan
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
ve chim » va chim, ve cham, ve chinh
ang xa » mang xa, dang xay, hoang xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty ((ang xa) or (lang xa)) hoi. hieu ((ve chim) or (va cham)) thuc dan thanh hai van triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((ang xa) OR (lang xa)) hoi. hieu ((ve chim) OR (va cham)) thuc dan thanh hai van triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((ang xa) or (lang xa)) hoi. hieu ((ve chim) or (va cham)) thuc dan thanh hai van triet*.