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

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