Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
bach hoa » bach khoa, bach ha, cach hoan
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
bach lo » sach lo, bach mao
va dinh » van dinh, va kinh, va tinh
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua

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 ky nang xa hoi. hieu vien ((bach lo) or (bach hoa)) va dinh ((vai cua) OR (hai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu vien ((bach lo) OR (bach hoa)) va dinh ((vai cua) OR (hai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu vien ((bach lo) or (bach hoa)) va dinh ((vai cua) OR (hai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu vien ((bach lo) or (bach hoa)) va dinh ((vai cua) OR (hai cua)) triet*.