Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh de » hanh de, thanh ve, thanh do
thanh di » thanh doi, thanh do, thanh dinh
xuc van » duc van, luc van, vuc van
cuu tre » cua tre, cau tren, cau treo
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
ve cam » ve cham, ve cac, va cam

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

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