Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dao » lanh dao, thanh dat, thanh dam
dang xay » dang van, van xay
lang ha » long ha
dao cua » dai cua, day cua, dan cua
va hanh » van hanh, va thanh, va danh
luc va » duc va, tuc va, loc va
tu bai » tu ban, tu bat, te bai
va cao » va cac, va co, va dao
bai ky » ban ky, sai ky, bac ky
va cam » va cham, va cac, va cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu bai ky ((lang ha) or (dang xay)) hoi. hieu ((va cam) OR (va cao)) luc va hanh dao cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ky ((lang ha) OR (dang xay)) hoi. hieu ((va cam) OR (va cao)) luc va hanh dao cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu bai ky ((lang ha) or (dang xay)) hoi. hieu ((va cam) OR (va cao)) luc va hanh dao cua triet".
• Adding a wildcard symbol may retrieve word variants: tu bai ky ((lang ha) or (dang xay)) hoi. hieu ((va cam) OR (va cao)) luc va hanh dao cua triet*.