Perhaps you should try some spelling variations:
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
hanh de » hanh ve, hanh kem
qua nam » quan nam, cua nam, quang nam
cua tre » cua te, cuu tre, cua triet
sach ky » sach y, sach ty, sach kem
nang xa » lang xa, nang ma, mang xa
sac ky » cac ky, sai ky
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) or (sac ky)) ((nang xa) or (nang x)) hoi. hieu qua nam thuc dan hanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) ((nang xa) OR (nang x)) hoi. hieu qua nam thuc dan hanh de cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) ((nang xa) or (nang x)) hoi. hieu qua nam thuc dan hanh de cua tre*.