Perhaps you should try some spelling variations:
gian cac » gian dan, gian cua
cua viet » ca viet, hoa viet, cua vat
thu sach » thuat sach, thuoc sach, thu hoach
tu nang » tru nang, tu nong, tu nano
nang ma » tang ma, sang ma, nang cao
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
tu sach » su sach, te sach, tu cach
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua

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 (thu sach)) tu nang ma hoi. hieu ((gian cac) OR (vien bach)) xuc va danh vi cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) tu nang ma hoi. hieu ((gian cac) or (vien bach)) xuc va danh vi cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) tu nang ma hoi. hieu ((gian cac) or (vien bach)) xuc va danh vi cua viet*.