Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, cay thuoc, nam thuc
hieu van » hieu va, thien van, lieu va
danh dai » danh dau, danh di, danh sai
hoc sach » hoc sinh, hoc cac, hoc anh
va danh » va dinh, va dan, va hanh
te sach » toc sach
nang o » nang co, nang ho, nang ro
cua te » cua tu
o hoc » co hoc, mo hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (hoc sach)) ky nang o hoc. hieu van ((lam thuoc) OR (am thuc)) va danh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (hoc sach)) ky nang o hoc. hieu van ((lam thuoc) OR (am thuc)) va danh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (hoc sach)) ky nang o hoc. hieu van ((lam thuoc) OR (am thuc)) va danh dai cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (hoc sach)) ky nang o hoc. hieu van ((lam thuoc) OR (am thuc)) va danh dai cua te*.