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 mai » nang ma, nang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, tu cach
te sach » toc sach
va dao » ca dao
va cao » va cac, va co, va bao

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 mai khoi. hieu ((va cao) or (va dao)) 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 mai khoi. hieu ((va cao) OR (va dao)) 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 mai khoi. hieu ((va cao) or (va dao)) duc va danh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) thi nang mai khoi. hieu ((va cao) or (va dao)) duc va danh vai cua triet*.