Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
cua triet » cua viet, su triet, va triet
nang co » nang cao, nang doc, nang noi
thi van » thi lan, thi hanh, thi nang
luu van » cuu van, luu hanh
vai cua » dai cua, hai cua, lai cua
sac ky » sai ky
co hoi » co hoc, co loi
luan » quan, lan

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sac ky) OR (cac ky)) nang co hoi. thi van nam ((luu van) or (luan van)) thanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (cac ky)) nang co hoi. thi van nam ((luu van) OR (luan van)) thanh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sac ky) OR (cac ky)) nang co hoi. thi van nam ((luu van) or (luan van)) thanh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: te ((sac ky) OR (cac ky)) nang co hoi. thi van nam ((luu van) or (luan van)) thanh vai cua triet*.