Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
danh doi » danh di, thanh doi, dung doi
hieu van » hieu va, thien van, lieu va
thuoc va » thuc va, thuoc ma, thuong va
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
tuoc va » nuoc va, duoc va, tuc va
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
su sac » su sach, su cac, su xac

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

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