Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang cai » nang cao, nang tai, nang cap
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cai hoi » cau hoi, dai hoi, cai hoa
va cham » va chat, va tham
duc van » duc va, duc tan, duc manh
ve cam » ve cham, ve cac, va cam

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 hoi. hieu ((ve cam) or (va cham)) duc van hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang cai hoi. hieu ((ve cam) OR (va cham)) duc van hanh dai cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang cai hoi. hieu ((ve cam) or (va cham)) duc van hanh dai cua triet*.