Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
cua viet » ca viet, hoa viet, cua vat
sach ty » sach y, sach tu, sach thu
thuc va » thuc vat, thuc dan, thuc day
truc va » thuc vat, trung va
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua
tuc va » tuc xa, duc va, thuc vat

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: so sach ty nang ma hoi. hieu hien dai ((((tuc va) OR (truc va))) OR (thuc va)) hanh vi cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang ma hoi. hieu hien dai ((((tuc va) OR (truc va))) or (thuc va)) hanh vi cua viet~".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang ma hoi. hieu hien dai ((((tuc va) OR (truc va))) or (thuc va)) hanh vi cua viet*.