Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
hanh thai » hinh thai, hanh tai, anh thai
hieu van » thien van, lieu va, hieu ve
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, cua triet
so sac » so sach, so dac
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho

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