Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
cac xuc » cam xuc, cac nuoc, chat xuc
vai dau » va dau, van dau, xvii dau
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
van hoc » van hoa
van hoi » van hoa, van hoe, van loi
ty lang » tay lang, ty xang, ty hang
van cac » van hac, van cau, van bac

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty lang ((van hoi) OR (van hoc)). hieu van cac xuc ((va danh) OR (ban hanh)) vai dau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty lang ((van hoi) OR (van hoc)). hieu van cac xuc ((va danh) or (ban hanh)) vai dau tren~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty lang ((van hoi) OR (van hoc)). hieu van cac xuc ((va danh) or (ban hanh)) vai dau tren*.