Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
sach van » sach han, sach va, bach van
thanh do » thanh de, thanh pho, thanh hoa
thanh di » thanh doi, thanh de, thanh dinh
te sach » toc sach
ve cac » va cac
ban xa » ban va, ban ma, ban da
cua te » cua tu

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 van ban xa hoi. hieu ((ve cac) or (vien cac)) duc va ((thanh di) OR (thanh do)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach van ban xa hoi. hieu ((ve cac) OR (vien cac)) duc va ((thanh di) OR (thanh do)) cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach van ban xa hoi. hieu ((ve cac) or (vien cac)) duc va ((thanh di) OR (thanh do)) cua te*".