Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
luc ban » duc ban, cuc ban, luc bat
y nang » ky nang, ly nang, v nang
va cam » va cham, va cai, va cau
va cao » va co, va dao, va bao
vi cua » vai cua, di cua
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y nang x hoi. hieu ((va cam) or (((va cao) OR (va cac)))) luc ban thanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang x hoi. hieu ((va cam) OR (((va cao) OR (va cac)))) luc ban thanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang x hoi. hieu ((va cam) or (((va cao) OR (va cac)))) luc ban thanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang x hoi. hieu ((va cam) or (((va cao) OR (va cac)))) luc ban thanh vi cua te*.