Perhaps you should try some spelling variations:
nang dien » hang dien, nang dieu, nang mien
mang dien » hang dien, quang dien, mach dien
ve triet » va trien, su triet
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
co sach » bo sach, cuon sach, hoc sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
cam thu » nam thu, cac thu, ca thu
thu va » thuc va, thue va, tu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach thi nang xa hoi. ((hieu ve) or (hieu qua)) cam thu va ((nang dien) OR (mang dien)) ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach thi nang xa hoi. ((hieu ve) OR (hieu qua)) cam thu va ((nang dien) OR (mang dien)) ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach thi nang xa hoi. ((hieu ve) or (hieu qua)) cam thu va ((nang dien) OR (mang dien)) ve triet".
• Adding a wildcard symbol may retrieve word variants: co sach thi nang xa hoi. ((hieu ve) or (hieu qua)) cam thu va ((nang dien) OR (mang dien)) ve triet*.