Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hieu thien » hieu hien, chieu chien, dieu khien
hach xuc » thach duc, hanh xu, cach xu
ly quang » le quang, vu quang
xuc may » xuc hay, truc may, phuc may
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
va chu » va cau, va chi
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 ((ty nang) or (ly quang)) x hoi. hieu thien hach xuc may tinh ((va chu) OR (va che)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ly quang)) x hoi. hieu thien hach xuc may tinh ((va chu) OR (va che)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ly quang)) x hoi. hieu thien hach xuc may tinh ((va chu) OR (va che)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ly quang)) x hoi. hieu thien hach xuc may tinh ((va chu) OR (va che)) tre*.