Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
danh tai » doanh tai, dinh tai, hanh tai
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
cuc tre » duc tre, cua tre, cuu tre
so sac » so dac
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: ((so sac) OR (so sach)) ky nang xa hoi. ((hieu van) or (hieu va)) bac xuc va danh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sac) OR (so sach)) ky nang xa hoi. ((hieu van) OR (hieu va)) bac xuc va danh tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sac) OR (so sach)) ky nang xa hoi. ((hieu van) or (hieu va)) bac xuc va danh tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: ((so sac) OR (so sach)) ky nang xa hoi. ((hieu van) or (hieu va)) bac xuc va danh tai cuc tre*.