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
cac truc » cau truc, cac tru, cac trung
truc va » thuc va, thuc vat, trung va
sach va » sach xa, sach ha, sach dao
sach v » sach y, sach 2, sach vay
va anh » van anh, va danh, va hanh
d su » da su, de su, _ 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 v) OR (sach va)) nang x ho. ((hieu vien) or (thieu nien)) cac truc va anh d su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach v) OR (sach va)) nang x ho. ((hieu vien) OR (thieu nien)) cac truc va anh d su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach v) OR (sach va)) nang x ho. ((hieu vien) or (thieu nien)) cac truc va anh d su triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach v) OR (sach va)) nang x ho. ((hieu vien) or (thieu nien)) cac truc va anh d su triet*.