Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
hanh dao » lanh dao, thanh dat, thanh dam
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
dao cua » dai cua, day cua, dan cua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
nam tuc » nam thuc, nam truc, nam tu
lang ha » long ha
ty lang » tay lang, ty xang, ty hang
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty lang ha hoi. hieu van ((nam tuc) or (((nam thuoc) or (am thuc)))) va hanh dao cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty lang ha hoi. hieu van ((nam tuc) OR (((nam thuoc) OR (am thuc)))) va hanh dao cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty lang ha hoi. hieu van ((nam tuc) or (((nam thuoc) or (am thuc)))) va hanh dao cua tre*.