Perhaps you should try some spelling variations:
thuong va » truong va, thong va, thuong mai
cac viet » cach viet, bac viet, ca viet
dang vat » dang van, dong vat, dang nhat
thuoc va » thuc va, thuoc ma, thuoc tai
hieu ve » hieu va, hieu van
dan vat » van vat, dan va, dan dat
ve nam » he nam, va nam, le nam
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang x hoi. hieu ve nam ((thuoc va) OR (thuong va)) ((dan vat) or (dang vat)) cac viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x hoi. hieu ve nam ((thuoc va) OR (thuong va)) ((dan vat) OR (dang vat)) cac viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang x hoi. hieu ve nam ((thuoc va) OR (thuong va)) ((dan vat) or (dang vat)) cac viet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. hieu ve nam ((thuoc va) OR (thuong va)) ((dan vat) or (dang vat)) cac viet*.