Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
va doanh » van doanh, vay doanh, va danh
doanh va » doan va, doanh tai, doanh cua
chua tre » chua tri, cua tre, chua trieu
sach ky » sac ky, sach y, sach ty
va chua » vua chua, ca chua, va chu
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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 ky nang ((x hoi) OR (o hoi)). ((lieu va) or (hieu qua)) pham duc va doanh va chua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang ((x hoi) OR (o hoi)). ((lieu va) OR (hieu qua)) pham duc va doanh va chua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang ((x hoi) OR (o hoi)). ((lieu va) or (hieu qua)) pham duc va doanh va chua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ((x hoi) OR (o hoi)). ((lieu va) or (hieu qua)) pham duc va doanh va chua tre*.