Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
va doanh » van doanh, vay doanh, va danh
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, ang xa
mang xa » lang xa, mang may, dang xay
cuc tre » duc tre, cua tre, cuu tre
sach 2 » sach y

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 2 ((((nang xa) or (mang xa))) or (nang ma)) hoi. hieu ve pham thuc va doanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach 2 ((((nang xa) OR (mang xa))) OR (nang ma)) hoi. hieu ve pham thuc va doanh tai cuc tre.
• Adding a wildcard symbol may retrieve word variants: tu sach 2 ((((nang xa) or (mang xa))) or (nang ma)) hoi. hieu ve pham thuc va doanh tai cuc tre*.