Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh vai » danh sai, danh va, doanh van
thi nang » thi cong, ki nang, thi hanh
nang lai » nang tai, mang lai, nang cai
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, tu cach
lai hoi » dai hoi, lai hoa, lai roi
te sach » toc sach
va cao » va cac, va dao, va bao
va co » vo co

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) or (te sach)) thi nang lai hoi. hieu ((va cao) OR (va co)) duc va danh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) thi nang lai hoi. hieu ((va cao) OR (va co)) duc va danh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) thi nang lai hoi. hieu ((va cao) OR (va co)) duc va danh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) thi nang lai hoi. hieu ((va cao) OR (va co)) duc va danh vai cua triet*.