Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
lanh hoi » lanh hai, lanh voi, hanh thoi
tu sach » thu sach, su sach, te sach
hoi cua » hoi chuc
vien da » vien dai, hien dai
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, su sach, vu khach
lao va » tao va, bao va, dao va
cao va » cao van, tao va, co va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (vu sach)) ky nang xa hoi. hieu vien da ((lao va) OR (cao va)) lanh hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ky nang xa hoi. hieu vien da ((lao va) OR (cao va)) lanh hoi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (vu sach)) ky nang xa hoi. hieu vien da ((lao va) OR (cao va)) lanh hoi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky nang xa hoi. hieu vien da ((lao va) OR (cao va)) lanh hoi cua tre*.