Perhaps you should try some spelling variations:
trung van » truong van, trong van, trung tuan
cua viet » ca viet, hoa viet, cua vat
trung va » truong va, trang va, trung ha
vu sach » vu bach, su sach, vu khach
sach ly » sach y, sach lo, sach ty
hieu ve » hieu van
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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 ly nang x hoi. ((hieu ve) or (hieu va)) cau ((trung van) OR (trung va)) hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ly nang x hoi. ((hieu ve) OR (hieu va)) cau ((trung van) OR (trung va)) hanh vi cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ly nang x hoi. ((hieu ve) or (hieu va)) cau ((trung van) OR (trung va)) hanh vi cua viet*".