Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dung hai » dung tai, dung ha, dung sai
dang hai » dang khai, hang hai, dong hai
thuc day » thuc dan, thuc vat
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan
hieu va » lieu va, hieu qua
nang co » nang cao, nang doc, nang noi
co hoi » co hoc, co loi
va am » va lam, va cam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang co hoi. hieu va am ((thuc va) OR (thuc day)) ((dang hai) OR (dung hai)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang co hoi. hieu va am ((thuc va) or (thuc day)) ((dang hai) OR (dung hai)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang co hoi. hieu va am ((thuc va) or (thuc day)) ((dang hai) OR (dung hai)) cua triet*.