Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
thu sach » tu sach, thuat sach, thuoc sach
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
va danh » va dinh, va dan, va hanh
hac tuc » thac toc, thai tuc
va hac » van hac, va khac, va cac
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty ((nang ma) or (van xay)) hoi. lieu va hac tuc ((van hanh) or (va danh)) va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang ma) OR (van xay)) hoi. lieu va hac tuc ((van hanh) OR (va danh)) va cua triet.
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang ma) or (van xay)) hoi. lieu va hac tuc ((van hanh) or (va danh)) va cua triet*.