Perhaps you should try some spelling variations:
xa thanh » va thanh, ha thanh, ta thanh
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
cac dac » cac dan, cac dai, cac bac
va tinh » may tinh
xang o » lang o, tang o, dang o
o hoi » co hoi, o hoc, o hai
ve su » va su

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty xang o hoi. hieu va cac dac ((xa thanh) OR (va tinh)) ve su triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach ty xang o hoi. hieu va cac dac ((xa thanh) or (va tinh)) ve su triet*.