Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
lam thuoc » nam thuoc, am thuc, cay thuoc
hieu van » hieu va, thien van, hieu ve
va thanh » gia thanh, ban thanh, va tinh
lam tuc » lam truoc, luat tuc, nam thuc
nang so » nang som, nang co, nang ho
tai cua » thai cua, tai cuc, tri cua
su sai » su tai, su hai, su dai
sai ky » sac ky
so hoc » co hoc, mo hoc, so hoa
cua tu » cua tuc, cua su, cua cu

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