Perhaps you should try some spelling variations:
cau thuc » cau truc, cuu thuc, can thuc
tinh lao » tinh nam, tinh va
dinh lam » dinh van
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
van cau » van dau, van hau, van chat
ly nang » ky nang, ly hang, ly vang
bo sach » co sach, hoc sach
cuu tre » cua tre, cau tren, cau treo
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) or (bo sach)) ly nang x hoi. hieu van cau thuc va ((dinh lam) OR (tinh lao)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (bo sach)) ly nang x hoi. hieu van cau thuc va ((dinh lam) OR (tinh lao)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (bo sach)) ly nang x hoi. hieu van cau thuc va ((dinh lam) OR (tinh lao)) cuu tre*".