Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
van hanh » van thanh, ban hanh, van anh
dang xay » dang van, van xay
bien cac » vien cac, dien cac, hien cac
xuc van » duc van, luc van, vuc van
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
bien ca » bien cua, bien va, bien ha
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: tu sach ky ((dang xay) or (nang x)) hoi. thieu ((bien ca) OR (bien cac)) xuc van hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((dang xay) OR (nang x)) hoi. thieu ((bien ca) OR (bien cac)) xuc van hanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((dang xay) or (nang x)) hoi. thieu ((bien ca) OR (bien cac)) xuc van hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((dang xay) or (nang x)) hoi. thieu ((bien ca) OR (bien cac)) xuc van hanh vi cua viet*.