Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh de, thanh do
hieu van » hieu va, thien van, lieu va
so sach » so sanh, co sach, hoc sach
thuc va » thuc vat, thuc dan, thuc day
van cam » van nam, van lam, van cau
dang ha » dong ha, dung ha, lang ha
bo sach » co sach, hoc sach
cuu tre » cua tre, cau tren, cau treo
ha hoi » hoa hoi, ha noi, xa hoi
xuc va » duc va, tuc va, luc va
y dang » ky dang, 2 dang, _ dang
di cuu » di cau, di cua, dinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) OR (bo sach)) y dang ha hoi. hieu van cam ((xuc va) or (thuc va)) thanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) y dang ha hoi. hieu van cam ((xuc va) OR (thuc va)) thanh di cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (bo sach)) y dang ha hoi. hieu van cam ((xuc va) or (thuc va)) thanh di cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (bo sach)) y dang ha hoi. hieu van cam ((xuc va) or (thuc va)) thanh di cuu tre*.