Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thuc dan » thuc hanh, hoc dan, thuc vat
thuc va » thuc vat, thuc day
thu sac » thu sach, thu san, thu xac
hieu va » lieu va, hieu qua
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
va tham » van tham, va cham, va thanh
sac ky » cac ky, sai ky
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: thu sac ky ((nang ma) or (sang ma)) hoa. hieu va tham ((thuc va) or (thuc dan)) hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky ((nang ma) OR (sang ma)) hoa. hieu va tham ((thuc va) OR (thuc dan)) hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: thu sac ky ((nang ma) or (sang ma)) hoa. hieu va tham ((thuc va) or (thuc dan)) hanh vi cua viet*.