Perhaps you should try some spelling variations:
trung van » truong van, trong van, trung va
cao trung » cao truong, tao trung, bao trung
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
hieu va » lieu va, hieu qua
hieu ve » hieu van
vu sach » vu bach, vu khach
ly nang » ky nang, ly hang, ly vang
su sach » so sach
x hoi » xa hoi, o hoi, x ho
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) OR (su sach)) ly nang x hoi. ((hieu ve) or (hieu va)) cao trung van hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ly nang x hoi. ((hieu ve) OR (hieu va)) cao trung van hanh vi su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (su sach)) ly nang x hoi. ((hieu ve) or (hieu va)) cao trung van hanh vi su triet*".