Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
dinh dat » dinh ket, dinh van, dinh lam
sach kem » hanh kem
hoc viet » hoc hien
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
dat hoc » dai hoc, vat hoc, dan hoc
mao va » mao van, cao va, bao va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach kem) or (sach ty)) nang xa hoi. hieu vien bach ((mao va) OR (tao va)) dinh dat hoc viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach kem) OR (sach ty)) nang xa hoi. hieu vien bach ((mao va) OR (tao va)) dinh dat hoc viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach kem) or (sach ty)) nang xa hoi. hieu vien bach ((mao va) OR (tao va)) dinh dat hoc viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach kem) or (sach ty)) nang xa hoi. hieu vien bach ((mao va) OR (tao va)) dinh dat hoc viet*.