Perhaps you should try some spelling variations:
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
qua hac » qua hai, qua cac, qua hoat
hac tuc » thac toc, thai tuc
va danh » va dinh, va dan, va hanh
thai va » thai van
tuc va » thuc va, truc va, tuc xa
hai va » hai van, hoi va, mai va

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 tru nang xa hoi. hieu qua hac tuc va danh ((hai va) OR (thai va)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tru nang xa hoi. hieu qua hac tuc va danh ((hai va) OR (thai va)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach tru nang xa hoi. hieu qua hac tuc va danh ((hai va) OR (thai va)) triet*.