Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
ban thanh » ban hanh, ban hang
trang va » tran van, hang va
hieu van » hieu va, thien van, lieu va
san cua » sang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
sac ky » sai ky
va hoc » van hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sac ky) or (cac ky)) trang va hoc. hieu van ((nam thuoc) or (cam xuc)) ban thanh san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (cac ky)) trang va hoc. hieu van ((nam thuoc) OR (cam xuc)) ban thanh san cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sac ky) or (cac ky)) trang va hoc. hieu van ((nam thuoc) or (cam xuc)) ban thanh san cua tre*.