Perhaps you should try some spelling variations:
phap duc » pham duc, phan duc, phap doc
va doanh » van doanh, vay doanh, va danh
doanh va » doan va, doanh tai, doanh cua
dau treo » dau tren, cau treo, dau theo
tu sach » thu sach, su sach, te sach
vu sach » vu bach, su sach, vu khach
hieu va » lieu va, hieu qua
va phap » va phat, ban phap
va dau » va dao
x hoi » xa hoi, o hoi, 5 hoi

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) OR (vu sach)) ky nang ((x hoi) OR (x ho)). hieu va phap duc va doanh va dau treo~.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky nang ((x hoi) or (x ho)). hieu va phap duc va doanh va dau treo*.