Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
manh hai » lanh hai, minh hai, thanh hai
danh hai » dang hai, lanh hai, danh hau
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
thuc va » thuc dan, thuc day
hieu va » lieu va, hieu qua
nang o » nang co, nang ho, nang ro
va am » va lam, va cam
o hai » co hai, so hai, o lai

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 o hai. hieu va am ((thuc va) OR (thuc vat)) ((danh hai) OR (manh hai)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang o hai. hieu va am ((thuc va) OR (thuc vat)) ((danh hai) or (manh hai)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hai. hieu va am ((thuc va) OR (thuc vat)) ((danh hai) or (manh hai)) cua triet*.