Perhaps you should try some spelling variations:
hanh hoi » hanh thoi, hanh noi, hanh hoa
vat hanh » vat thanh, van hanh, va hanh
dang xa » dang xay, lang xa, dang ha
sach ky » sac ky, sach y, sach kem
van cau » van dau, van hau, van chat
van hac » van hoc, van ha, van hai
sach ty » sach y, sach tu, sach thu
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sach ky) OR (sach ty)) dang xa hoi. hieu ((van cau) or (van hac)) thuc vat hanh hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ky) OR (sach ty)) dang xa hoi. hieu ((van cau) OR (van hac)) thuc vat hanh hoi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ky) OR (sach ty)) dang xa hoi. hieu ((van cau) or (van hac)) thuc vat hanh hoi cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ky) OR (sach ty)) dang xa hoi. hieu ((van cau) or (van hac)) thuc vat hanh hoi cua tre*.