Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, dien bien
bieu hien » dieu khien, bien phien, bien nien
thanh vi » hanh vi, thanh va, thanh ve
xa thanh » va thanh, ha thanh, ta thanh
tu sach » thu sach, te sach, tu cach
cac tuc » cac toc, cac tu, cac tac
luy tre » luyen tre
su sach » so sach, vu sach
vi luy » vi lua, vi luu
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: ((tu sach) or (su sach)) ky nang x hoi. ((bieu hien) OR (dieu hien)) cac tuc xa thanh vi luy tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x hoi. ((bieu hien) OR (dieu hien)) cac tuc xa thanh vi luy tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang x hoi. ((bieu hien) OR (dieu hien)) cac tuc xa thanh vi luy tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang x hoi. ((bieu hien) OR (dieu hien)) cac tuc xa thanh vi luy tre*.