Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thuc van » thuc vat, thuc va, hoc van
hanh tai » thanh tai, hang tai, han tai
thuc dan » hoc dan, thuc vat
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
tai cua » thai cua, tai cuc, tri cua
so sanh » do sanh
va cam » va cham, va cac, va cao
sanh 7 » sanh _
ma hoi » mai hoi, xa hoi, ma hoa
7 tang » 6 tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh 7 tang ma hoi. hieu va cam ((((thuc van) OR (thuc hanh))) or (thuc dan)) hanh tai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh 7 tang ma hoi. hieu va cam ((((thuc van) OR (thuc hanh))) OR (thuc dan)) hanh tai cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh 7 tang ma hoi. hieu va cam ((((thuc van) OR (thuc hanh))) or (thuc dan)) hanh tai cua viet*".