Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
hanh doi » thanh doi, hanh noi, hang doi
vat hanh » vat thanh, van hanh, va hanh
nam thuc » am thuc, nam thu, nam tu
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
sach ky » sach y, sach ty, sach kem
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky

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 hoi. hieu ve ((nam thuoc) OR (nam thuc)) vat hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) nang xa hoi. hieu ve ((nam thuoc) OR (nam thuc)) vat hanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sac ky)) nang xa hoi. hieu ve ((nam thuoc) OR (nam thuc)) vat hanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) nang xa hoi. hieu ve ((nam thuoc) OR (nam thuc)) vat hanh doi cua tre*.