Perhaps you should try some spelling variations:
lap thuc » tap thuc, luan thuc, phap thuc
tu sach » thu sach, su sach, te sach
tinh he » trinh he, hinh he, tinh ha
tinh de » tinh da, sinh de, minh de
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
sach 2 » sach y
ma hoi » xa hoi, ma hoa, me hoi
2 nang » v nang
va lap » va dap

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 ((ma hoi) or (mai hoi)). hieu va lap thuc va ((tinh de) OR (tinh he)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach 2 nang ((ma hoi) OR (mai hoi)). hieu va lap thuc va ((tinh de) OR (tinh he)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach 2 nang ((ma hoi) or (mai hoi)). hieu va lap thuc va ((tinh de) OR (tinh he)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach 2 nang ((ma hoi) or (mai hoi)). hieu va lap thuc va ((tinh de) OR (tinh he)) cua tre*.