Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
tinh di » tinh doi, trinh di, tinh da
thuc va » thuc vat, thuc dan, thuc day
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
tuc va » truc va, tuc xa, duc va
nang o » nang co, nang ho, nang ro
di cua » dai cua, doi cua, de cua
o hoi » co hoi, o hoc, o hai

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 nang o hoi. ((hieu ve) OR (hieu qua)) cau ((tuc va) OR (thuc va)) tinh di cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang o hoi. ((hieu ve) or (hieu qua)) cau ((tuc va) or (thuc va)) tinh di cua tre*.