Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
thanh hai » thanh phan, thanh hoa, thanh san
cua viet » ca viet, hoa viet, cua vat
hieu ve » hieu va, hieu van
thu vat » thuc vat, thu va, thuat vat
hai cua » thai cua, dai cua, hoi cua
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
ma hoi » mai hoi, ma hoa, me hoi
ve nam » he nam, va nam, le nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang ((ma hoi) OR (xa hoi)). hieu ve nam thu vat thanh hai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang ((ma hoi) OR (xa hoi)). hieu ve nam thu vat thanh hai cua viet*".