Perhaps you should try some spelling variations:
ban hanh » ban hang
lang van » dang van, tang van, hoang van
dieu tra » dieu tri, kiem tra, dieu cua
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
van hanh » van thanh, van anh, van ban
tra tre » tran tren, tran tri, tran tro
ky lang » ky nang, ky dang, ky tang
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac cuoc
te san » te ban, ke san, tu san
san ky » sang ky, van ky, dan ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te san ky lang van hoa. hieu va ((cac luc) OR (cac nuoc)) ((van hanh) or (ban hanh)) dieu tra tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ky lang van hoa. hieu va ((cac luc) OR (cac nuoc)) ((van hanh) OR (ban hanh)) dieu tra tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te san ky lang van hoa. hieu va ((cac luc) OR (cac nuoc)) ((van hanh) or (ban hanh)) dieu tra tre".
• Adding a wildcard symbol may retrieve word variants: te san ky lang van hoa. hieu va ((cac luc) OR (cac nuoc)) ((van hanh) or (ban hanh)) dieu tra tre*.