Perhaps you should try some spelling variations:
thanh dinh » thanh binh, thanh tinh, thanh vinh
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
van cam » van nam, van lam, van cau
dang ha » dong ha, dung ha, lang ha
y dang » ky dang, 2 dang, _ dang
tuc va » truc va, tuc xa, duc va

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 y dang ha noi. hieu van cam ((tuc va) or (thuc va)) thanh dinh ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y dang ha noi. hieu van cam ((tuc va) OR (thuc va)) thanh dinh ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y dang ha noi. hieu van cam ((tuc va) or (thuc va)) thanh dinh ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: su sach y dang ha noi. hieu van cam ((tuc va) or (thuc va)) thanh dinh ((cuu tre) OR (cua tre))*.