Perhaps you should try some spelling variations:
phap thuc » phap thu, phap hoc, phap tu
sach ky » sach ty, sach kem, sach hay
nang xa » nang x, lang xa, nang ma
va phap » va phat, ban phap
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh de » hanh ve, hanh kem
cua tre » cua te, cuu tre, cua triet
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 (sach y))) or (sac ky)) nang xa hoi. lieu va phap thuc va hanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((((sach ky) OR (sach y))) OR (sac ky)) nang xa hoi. lieu va phap thuc va hanh de cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((((sach ky) or (sach y))) or (sac ky)) nang xa hoi. lieu va phap thuc va hanh de cua tre*.