Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, hieu ve
thai cua » tai cuc, tri cua, dai cua
than cua » nhan cua, ban cua, gian cua
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va danh » va dinh, va dan, va hanh
xuc va » duc va, tuc va, luc va

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 ky nang xa hoi. ((hieu van) or (lieu va)) bac xuc va danh ((thai cua) OR (than cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. ((hieu van) OR (lieu va)) bac xuc va danh ((thai cua) OR (than cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. ((hieu van) or (lieu va)) bac xuc va danh ((thai cua) OR (than cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. ((hieu van) or (lieu va)) bac xuc va danh ((thai cua) OR (than cua)) tre*.