Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
tham thuc » nham thuc, pham thuc, tam thuc
cua viet » ca viet, hoa viet, cua vat
dinh vi » dinh ve, dinh viet, dinh tri
danh vi » hanh vi, danh di, danh va
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
va tham » van tham, va cham, va thanh

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky tang xa hoi. hieu va tham thuc va ((danh vi) OR (dinh vi)) cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat sach)) ky tang xa hoi. hieu va tham thuc va ((danh vi) OR (dinh vi)) cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ky tang xa hoi. hieu va tham thuc va ((danh vi) OR (dinh vi)) cua viet*.