Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
thanh tai » thanh hai, thanh toan, thanh san
hieu van » hieu va, thien van, lieu va
nang so » nang som, nang co, nang ho
lam tuc » lam truoc, luat tuc, nam thuc
su sai » su tai, su hai, su dai
cua te » cua tu
sai ky » sac ky
so hoc » co hoc, mo hoc, so hoa

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

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