Perhaps you should try some spelling variations:
khien hach » thien hach, khien thich, hien hanh
hach xuc » thach duc, hanh xu, cach xu
choi tre » cho tre, tuoi tre, khoe tre
sach tu » sach thu, cach tu, sach uu
sach ty » sach y, sach thu, xach tay
xuc may » xuc hay, truc may, phuc may
tinh va » tich va, trinh van, trinh vat
chi tre » cho tre, chi tro, chi tiet
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) or (sach tu)) nang x hoi. dieu khien hach xuc may tinh va ((chi tre) OR (choi tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tu)) nang x hoi. dieu khien hach xuc may tinh va ((chi tre) OR (choi tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach tu)) nang x hoi. dieu khien hach xuc may tinh va ((chi tre) OR (choi tre))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach tu)) nang x hoi. dieu khien hach xuc may tinh va ((chi tre) OR (choi tre))*.