Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tru nang » tra nang, tri nang, truc nano
sach tru » sach truc, sach thu, sach tu
va kinh » va tinh, qua kinh
nang xa » nang x, lang xa, nang ma
va cua » va chua, via cua, ca cua
cua te » cua tu
va dao » ca dao
va cao » va cac, va co, va bao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach tru nang xa hoi. hieu ((va cao) OR (va dao)) duc ((va kinh) or (may tinh)) va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tru nang xa hoi. hieu ((va cao) OR (va dao)) duc ((va kinh) OR (may tinh)) va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach tru nang xa hoi. hieu ((va cao) OR (va dao)) duc ((va kinh) or (may tinh)) va cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach tru nang xa hoi. hieu ((va cao) OR (va dao)) duc ((va kinh) or (may tinh)) va cua te*.