Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
tru nang » tra nang, tri nang, truc nano
sach tru » sach truc, sach thu, sach tu
te sach » toc sach
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ve nam » he nam, va nam, le nam
cua te » cua tu
cua su » qua su

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tru nang xa hoi. hieu ve nam thuc ((va hanh) OR (va danh)) de ((cua te) OR (cua su))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tru nang xa hoi. hieu ve nam thuc ((va hanh) OR (va danh)) de ((cua te) or (cua su))~".
• Adding a wildcard symbol may retrieve word variants: te sach tru nang xa hoi. hieu ve nam thuc ((va hanh) OR (va danh)) de ((cua te) or (cua su))*.