Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
luc van » luoc van, luu van, duc van
y nang » ky nang, ly nang, v nang
ve cao » ve bao, ve cac, ve co
va cao » va cac, va co, va dao
de cua » le cua, te cua, dieu cua

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: thu sach y nang xa hoi. hieu ((ve cao) OR (va cao)) luc van hanh ((de cua) OR (dai cua)) te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang xa hoi. hieu ((ve cao) OR (va cao)) luc van hanh ((de cua) or (dai cua)) te~".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang xa hoi. hieu ((ve cao) OR (va cao)) luc van hanh ((de cua) or (dai cua)) te*.