Perhaps you should try some spelling variations:
chieu chien » thien chien
hieu hien » bieu hien, dieu hien, dieu khien
danh doi » danh di, thanh doi, dung doi
nang xa » nang x, lang xa, nang ma
tuoc va » thuoc va, nuoc va, duoc va
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
vu san » va san, vu ban
san ky » sang ky, van ky, dan ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu san ky nang xa hoi. ((hieu hien) OR (chieu chien)) bach ((tuoc va) or (duc va)) danh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu san ky nang xa hoi. ((hieu hien) OR (chieu chien)) bach ((tuoc va) OR (duc va)) danh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu san ky nang xa hoi. ((hieu hien) OR (chieu chien)) bach ((tuoc va) or (duc va)) danh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu san ky nang xa hoi. ((hieu hien) OR (chieu chien)) bach ((tuoc va) or (duc va)) danh doi cua tre*.