Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh hoa » thanh pho
sach ty » sach y, sach tu, sach thu
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang ma hoa. hieu ((ve cam) OR (ve cac)) thuc va ((thanh hoa) or (hanh kem)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ma hoa. hieu ((ve cam) OR (ve cac)) thuc va ((thanh hoa) OR (hanh kem)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ma hoa. hieu ((ve cam) OR (ve cac)) thuc va ((thanh hoa) or (hanh kem)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ma hoa. hieu ((ve cam) OR (ve cac)) thuc va ((thanh hoa) or (hanh kem)) cua triet*.