Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
cao hoi » cau hoi, co hoi, cao hoc
sach ky » sac ky, sach kem, sach hay
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
sach ty » sach tu, sach thu, xach tay
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((((sach ky) OR (sach ty))) or (sach y)) nang cao hoi. hieu ve pham thuc day hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((((sach ky) OR (sach ty))) OR (sach y)) nang cao hoi. hieu ve pham thuc day hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((((sach ky) OR (sach ty))) or (sach y)) nang cao hoi. hieu ve pham thuc day hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((((sach ky) OR (sach ty))) or (sach y)) nang cao hoi. hieu ve pham thuc day hanh di cua tre*.