Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van chat » cao chat
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, duc va
dap vi » dap ve, lap vi, dap va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuoc sach)) ky lang xa hoi. hieu van chat ((tuc va) OR (tuc xa)) dap vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) ky lang xa hoi. hieu van chat ((tuc va) OR (tuc xa)) dap vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuoc sach)) ky lang xa hoi. hieu van chat ((tuc va) OR (tuc xa)) dap vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) ky lang xa hoi. hieu van chat ((tuc va) OR (tuc xa)) dap vi cua tre*.