Perhaps you should try some spelling variations:
dong dai » duong dai, dong tai, dong dat
hieu ve » hieu va, hieu van
tuc hat » tuc hai, tu hat, luc nhat
cua tre » cua te, cuu tre, cua triet
vu sac » vu sach, vu san, va sac
sac ky » cac ky, sai ky
tuc ha » tuc hai, thuc ha, tuc xa
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: vu sac ky nang x hoi. ((hieu ve) or (lieu va)) cam ((tuc ha) OR (tuc hat)) dong dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang x hoi. ((hieu ve) OR (lieu va)) cam ((tuc ha) OR (tuc hat)) dong dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang x hoi. ((hieu ve) or (lieu va)) cam ((tuc ha) OR (tuc hat)) dong dai cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sac ky nang x hoi. ((hieu ve) or (lieu va)) cam ((tuc ha) OR (tuc hat)) dong dai cua tre*.