Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
sach ty » sach y, sach tu, sach thu
doi cua » dai cua, hoi cua
duc van » duc va, duc tan, duc manh
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
ve cao » va cao, ve bao, ve co
di cua » dai cua, de cua, do cua
ve cac » va cac, vien cac

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: toc sach ty nang xa hoi. hieu ((ve cao) OR (ve cac)) duc van thanh ((di cua) OR (doi cua)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang xa hoi. hieu ((ve cao) or (ve cac)) duc van thanh ((di cua) OR (doi cua)) cau~".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang xa hoi. hieu ((ve cao) or (ve cac)) duc van thanh ((di cua) OR (doi cua)) cau*.