Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
sinh dai » sinh thai, si dai, sinh vat
dinh dai » dinh dat, dinh dao, dinh tai
sach kem » hanh kem
hoc viet » hoc hien
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
bach lo » sach lo, bach hoa, bach mao
lo va » lo van, lao va, ly 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 lo va ((dinh dai) OR (sinh dai)) 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 lo va ((dinh dai) OR (sinh dai)) 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 lo va ((dinh dai) OR (sinh dai)) hoc viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach kem) or (sach ty)) nang xa hoi. hieu vien bach lo va ((dinh dai) OR (sinh dai)) hoc viet*.