Perhaps you should try some spelling variations:
cua viet » ca viet, cua vat, cua dieu
so sinh » so sanh, so tinh, cho sinh
may hoi » may thoi, tay hoi, mai hoi
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
y mang » cay mang
ve cam » ve cham, va cam, ve cai
sinh y » sinh ly
ve cac » va cac, vien cac

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

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