Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang cai » nang cao, nang tai, nang can
hanh vai » hanh vi, hanh va, hanh tai
nang cap » nang cao, nang cham, nang phap
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va
ve cam » ve cham, va cam, ve cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((nang cai) OR (nang cap)) hoi. hieu ((ve cam) or (ve cac)) luc va hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang cai) OR (nang cap)) hoi. hieu ((ve cam) OR (ve cac)) luc va hanh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang cai) OR (nang cap)) hoi. hieu ((ve cam) or (ve cac)) luc va hanh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang cai) OR (nang cap)) hoi. hieu ((ve cam) or (ve cac)) luc va hanh vai cua triet*.