Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thanh doi » thanh loi, thanh moi, thanh do
thuc van » thuc vat, thuc dan, thuc va
thanh di » thanh de, thanh do, thanh dinh
toc sach » hoc sach, doc sach, thuoc sach
tang van » dang van, hoang van, trong van
van hoi » van hoa, van hoc, van hoe
cua tre » cua te, cuu tre, cua triet
hieu v » hieu va, hieu ve, hieu 2
v pham » vi pham, d pham
sach o » sach lo, sac o, sach y
o tang » do tang, 6 tang, 7 tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach o tang van hoi. hieu v pham thuc van ((thanh di) or (thanh doi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach o tang van hoi. hieu v pham thuc van ((thanh di) OR (thanh doi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach o tang van hoi. hieu v pham thuc van ((thanh di) or (thanh doi)) cua tre*.