Perhaps you should try some spelling variations:
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
cam thuc » am thuc, nam thuc, cam thu
sach ky » sach y, sach ty, sach kem
hanh di » hanh vi, hanh de, hang di
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
sac ky » cac ky, sai ky
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: su ((sach ky) or (sac ky)) ((nang xa) or (nang x)) hoi. hieu ve cam thuc dan hanh di 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 ve cam thuc dan hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) ((nang xa) or (nang x)) hoi. hieu ve cam thuc dan hanh di cua tre*.