Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hanh voi » hanh noi, hanh moi, lanh voi
danh mai » danh sai, doanh moi, dinh moi
hanh vii » hanh va, hanh noi, hanh ve
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
thuc va » thuc vat, thuc dan, thuc day
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ty danh » ty doanh, ty anh, ky danh
cu tren » tu tren, dua tren

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 danh mai hoi. hieu ve pham thuc va ((((hanh vii) OR (hanh voi))) or (hanh vi)) cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty danh mai hoi. hieu ve pham thuc va ((((hanh vii) OR (hanh voi))) OR (hanh vi)) cu tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty danh mai hoi. hieu ve pham thuc va ((((hanh vii) OR (hanh voi))) or (hanh vi)) cu tren*".