Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu vien » hieu hien, hieu viec, hieu tieng
su triet » su viet, su tien, ve triet
khang di » khang vi, khang voi, hang doi
truc van » truc va, thuc van, truc ban
dai truc » dai thuc, doan truc, dai trung
hang di » hang doi, hang vi, hang dien
su sach » so sach, vu sach
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
x hoi » xa hoi, o hoi, x ho

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 v nang x hoi. ((hieu vien) or (thieu nien)) dai truc van ((khang di) OR (hang di)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang x hoi. ((hieu vien) OR (thieu nien)) dai truc van ((khang di) OR (hang di)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang x hoi. ((hieu vien) or (thieu nien)) dai truc van ((khang di) OR (hang di)) su triet".
• Adding a wildcard symbol may retrieve word variants: su sach v nang x hoi. ((hieu vien) or (thieu nien)) dai truc van ((khang di) OR (hang di)) su triet*.