Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
nam thuc » nam thuoc, am thuc, nam thu
tu sach » su sach, te sach, tu cach
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
va nam » van nam, ha nam, va nay
vi cua » vai cua, di cua
cua te » cua tu

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) or (thu sach)) ty xang xa hoi. hieu va nam thuc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty xang xa hoi. hieu va nam thuc va hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ty xang xa hoi. hieu va nam thuc va hanh vi cua te*.