Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » va thanh, va danh, ban hanh
va dinh » van dinh, va kinh, va tinh
y nang » ky nang, ly nang, v nang
va cao » va cac, va co, va dao
ca su » cua su, ca sau, va su

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 y nang xa hoi. hieu va cao su ((((va hanh) or (van hanh))) or (va dinh)) ca su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu va cao su ((((va hanh) OR (van hanh))) OR (va dinh)) ca su triet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu va cao su ((((va hanh) or (van hanh))) or (va dinh)) ca su triet*.