Perhaps you should try some spelling variations:
cac trung » cac truong, dac trung, bac trung
trung van » truong van, trong van, trung va
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
su sach » so sach
vu sach » vu bach, vu khach
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua

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