Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
thien nang » thien bang, thien dang, trien nang
thien van » thi van
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cua tre » cuu tre, cua triet, dua tren
ca tren » cau tren, cu tren, la tren
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thien nang x hoi. thien van nam thuc va hanh vi ((((cua tre) or (cua te))) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thien nang x hoi. thien van nam thuc va hanh vi ((((cua tre) OR (cua te))) OR (ca tren)).
• Adding a wildcard symbol may retrieve word variants: su sach thien nang x hoi. thien van nam thuc va hanh vi ((((cua tre) or (cua te))) or (ca tren))*.