Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
truc va » thuc va, thuc vat, trung va
hieu ve » hieu va, hieu van
so sach » bo sach, co sach, hoc sach
nang ma » tang ma, sang ma, nang cao
so sanh » do sanh
y nang » ky nang, ly nang, v nang
tuc va » thuc va, tuc xa, duc va
vi cua » vai cua, di cua
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) OR (so sanh)) y nang ma hoa. hieu ve cam ((tuc va) or (truc va)) hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) y nang ma hoa. hieu ve cam ((tuc va) OR (truc va)) hanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (so sanh)) y nang ma hoa. hieu ve cam ((tuc va) or (truc va)) hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (so sanh)) y nang ma hoa. hieu ve cam ((tuc va) or (truc va)) hanh vi cua viet*.