Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
nang xa » nang x, lang xa, nang ma
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
va cao » va cac, va dao, va bao
luc va » duc va, tuc va, loc va
di cau » da cau, diem cau
va co » vo co

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach v nang xa hoi. hieu ((va cao) or (va co)) luc va danh di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v nang xa hoi. hieu ((va cao) OR (va co)) luc va danh di cau tren.
• Adding a wildcard symbol may retrieve word variants: toc sach v nang xa hoi. hieu ((va cao) or (va co)) luc va danh di cau tren*.