Perhaps you should try some spelling variations:
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
hanh doi » thanh doi, hanh noi, hang doi
sach ky » sac ky, sach ty, sach kem
cao hoi » cau hoi, co hoi, cao hoc
ve pham » v pham, ve phan, ve phat
doi cua » dai cua, hoi cua
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: thu ((sach ky) or (sach y)) nang cao hoi. hieu ((ve pham) OR (vi pham)) thuc day hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach y)) nang cao hoi. hieu ((ve pham) OR (vi pham)) thuc day hanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sach y)) nang cao hoi. hieu ((ve pham) OR (vi pham)) thuc day hanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach y)) nang cao hoi. hieu ((ve pham) OR (vi pham)) thuc day hanh doi cua tre*.