Perhaps you should try some spelling variations:
thien van » thi van
so sach » so sanh, bo sach, co sach
sach tu » sach thu, cach tu, sach ty
danh vi » hanh vi, dinh vi, danh di
thuc va » thuc vat, thuc dan, thuc day
tu hang » thu hang, tu hanh, tu hung
van lam » van nam
cua tre » cua te, cuu tre, cua triet
tuc va » truc va, tuc xa, duc va
hang o » hang do, hang o2, hoang o
vi cua » vai cua, di cua
o hoi » co hoi, o hoc, o hai

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 tu hang o hoi. thien van lam ((tuc va) OR (thuc va)) danh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tu hang o hoi. thien van lam ((tuc va) OR (thuc va)) danh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach tu hang o hoi. thien van lam ((tuc va) OR (thuc va)) danh vi cua tre*.