Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
danh vai » danh sai, danh va, doanh van
va danh » va dinh, va dan, va hanh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
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 sac ky nang o hoi. ((lieu va) or (hieu qua)) pham duc va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sac ky nang o hoi. ((lieu va) OR (hieu qua)) pham duc va danh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat sac ky nang o hoi. ((lieu va) or (hieu qua)) pham duc va danh vai cua tre*.