Perhaps you should try some spelling variations:
thieu nien » thien nhien
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
cac doi » cac dai, cac toi, cac don
cau doi » cau hoi, cau do, cau noi
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thu nang xa hoi. thieu nien ((cac doi) OR (cau doi)) van hanh vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu nang xa hoi. thieu nien ((cac doi) OR (cau doi)) van hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: su sach thu nang xa hoi. thieu nien ((cac doi) OR (cau doi)) van hanh vi su triet*.