Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hac tuc » thac toc, thai tuc
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
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 ky ((nang xa) or (van xay)) hoi. lieu va hac tuc ((va hanh) or (va danh)) va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (van xay)) hoi. lieu va hac tuc ((va hanh) OR (va danh)) va cua triet.
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) or (van xay)) hoi. lieu va hac tuc ((va hanh) or (va danh)) va cua triet*.