Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
vai cua » dai cua, hai cua, lai cua
va cau » van cau, va cac, va dau
cua te » cua tu
5 hoi » o hoi
o hoc » co hoc, mo hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((5 hoi) or (o hoc)). lieu va cau truc va danh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((5 hoi) OR (o hoc)). lieu va cau truc va danh vai cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((5 hoi) or (o hoc)). lieu va cau truc va danh vai cua te*.