Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
tinh di » tinh doi, trinh di, tinh da
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
cau tre » cau tren, cau treo, cau tra
tuc va » truc va, tuc xa, duc va
di cau » da cau, diem cau
x hoi » xa hoi, o hoi, x ho

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