Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh tai » thanh tai, hang tai, han tai
hanh vai » hanh vi, hanh va, hanh van
nang cai » nang cao, nang tai, nang cap
hieu van » hieu va, thien van, lieu va
cam duc » cam xuc, cao duc, pham duc
su sach » vu sach
cai hoa » cau hoa, cam hoa, dai hoa
so sach » so sanh, bo sach, co sach
van cam » van nam, van lam, van cau

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) or (so sach)) ky nang cai hoa. hieu van cam duc va ((hanh vai) OR (hanh tai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang cai hoa. hieu van cam duc va ((hanh vai) OR (hanh tai)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky nang cai hoa. hieu van cam duc va ((hanh vai) OR (hanh tai)) cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky nang cai hoa. hieu van cam duc va ((hanh vai) OR (hanh tai)) cua triet*.