Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thanh di » thanh doi, thanh de, thanh do
sach thu » sach thue, sach thieu, sach tham
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de cua

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 thu ((nang x) or (lang xa)) hoi. hieu va tham ((xuc va) OR (tuc va)) thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thu ((nang x) OR (lang xa)) hoi. hieu va tham ((xuc va) OR (tuc va)) thanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach thu ((nang x) or (lang xa)) hoi. hieu va tham ((xuc va) OR (tuc va)) thanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach thu ((nang x) or (lang xa)) hoi. hieu va tham ((xuc va) OR (tuc va)) thanh di cua tre*.