Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh vi » hanh vi, thanh va, thanh ve
te sach » toc sach
sach ky » sac ky, sach y, sach ty
lang xa » dang xay, lang van
lang ha » long ha
hieu ve » hieu va, hieu van
cu tren » tu tren, dua tren
ve cac » va cac, vien cac
du van » duy van, duc van, tu van
vi cu » vi su, vi xu, vi du

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 ky ((lang xa) or (lang ha)) hoi. hieu ve cac du van thanh vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((lang xa) OR (lang ha)) hoi. hieu ve cac du van thanh vi cu tren.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) or (lang ha)) hoi. hieu ve cac du van thanh vi cu tren*.