Perhaps you should try some spelling variations:
bieu hien » dieu hien, bien phien, bien nien
truc may » tren may, truc va
tinh va » tich va, trinh van, trinh vat
xuc may » xuc hay, phuc may
te sach » toc sach
huu tre » huu tri, cuu tre, huu them
sach ky » sac ky, sach y, sach ty
nang o » nang co, nang ho, nang ro
va huu » vu huu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang o hoi. ((bieu hien) or (dieu khien)) hanh ((xuc may) OR (truc may)) tinh va huu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang o hoi. ((bieu hien) OR (dieu khien)) hanh ((xuc may) OR (truc may)) tinh va huu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang o hoi. ((bieu hien) or (dieu khien)) hanh ((xuc may) OR (truc may)) tinh va huu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang o hoi. ((bieu hien) or (dieu khien)) hanh ((xuc may) OR (truc may)) tinh va huu tre*.