Perhaps you should try some spelling variations:
gian cac » gian dan, gian cua
cua viet » ca viet, hoa viet, cua vat
nang ma » tang ma, sang ma, nang cao
sach ty » sach tu, sach thu, xach tay
va hanh » van hanh, va thanh, va danh
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.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) OR (sach y)) nang ma hoi. hieu ((gian cac) or (vien bach)) xuc va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang ma hoi. hieu ((gian cac) OR (vien bach)) xuc va hanh vi cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach y)) nang ma hoi. hieu ((gian cac) or (vien bach)) xuc va hanh vi cua viet*".