Perhaps you should try some spelling variations:
thanh than » thanh thanh, thanh thang, thanh toan
cua viet » ca viet, hoa viet, cua vat
than cua » nhan cua, thai cua, ban cua
va thanh » gia thanh, ban thanh, va tinh
nam thuc » nam thuoc, am thuc, nam thu
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
sach ty » sach y, sach thu, xach tay
sach tu » sach thu, cach tu, sach uu
va nam » van nam, ha nam, va nay
x hoi » xa hoi, o hoi, x ho
o hoc » co hoc, mo hoc, so hoc

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 ty) OR (sach tu)) nang ((x hoi) or (o hoc)). hieu va nam thuc va thanh than cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tu)) nang ((x hoi) OR (o hoc)). hieu va nam thuc va thanh than cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach tu)) nang ((x hoi) or (o hoc)). hieu va nam thuc va thanh than cua viet*".