Perhaps you should try some spelling variations:
hang dien » quang dien, dang dieu, nhan dien
su triet » su viet, su tien, ve triet
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
dien su » dien tu, nien su, den su
thue va » thuc va, thuyet va, thuc vat
co sach » bo sach, cuon sach, hoc sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
thu va » thuc va, tu va, thu ha

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) OR (thue va)) hang dien su 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) OR (thue va)) hang dien su 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) OR (thue va)) hang dien su triet".
• Adding a wildcard symbol may retrieve word variants: co sach thi nang xa hoi. ((hieu ve) or (hieu qua)) cam ((thu va) OR (thue va)) hang dien su triet*.