Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dien » nhanh dien, hang dien, danh dien
dien cua » dieu cua, dien cuc, dien cu
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach ty, sach kem
nang ro » nang co, nang ho, nang ra
ro hai » co hai, o hai, so hai
va cau » van cau, va cac, va dau
luc va » duc va, tuc va, loc va
ke cau » ket cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) OR (sach y)) nang ro hai. hieu ((ke cau) or (va cau)) luc va hanh dien cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang ro hai. hieu ((ke cau) OR (va cau)) luc va hanh dien cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach y)) nang ro hai. hieu ((ke cau) or (va cau)) luc va hanh dien cua triet".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach y)) nang ro hai. hieu ((ke cau) or (va cau)) luc va hanh dien cua triet*.