Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cam thuc » am thuc, nam thuc, cam thu
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, dua tren
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
nang xa » nang x, lang xa, nang ma
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((nang xa) or (tang ma)) hoi. hieu va cam thuc va tinh va ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (tang ma)) hoi. hieu va cam thuc va tinh va ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) or (tang ma)) hoi. hieu va cam thuc va tinh va ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (tang ma)) hoi. hieu va cam thuc va tinh va ((cua tre) OR (cua triet))*.