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
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
thuc va » thuc vat, thuc dan, thuc day
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 (lang xa)) 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 (lang xa)) hoi. hieu ve pham thuc va doanh tai cuc tre.
• Adding a wildcard symbol may retrieve word variants: tu sach 2 ((nang xa) or (lang xa)) hoi. hieu ve pham thuc va doanh tai cuc tre*.