Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, va danh
than luc » nhan luc, than duc, thanh luu
lang van » dang van, tang van, hoang van
tham luc » tham nuoc, tham thuc, nhan luc
cuu tre » cua tre, cau tren, cau treo
tai cuu » tai cuc, tai buu, tai cua
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay
tai ky » thai ky, trai ky, sai 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 tai ky ((lang xa) OR (lang van)) hoi. hieu va ((tham luc) or (than luc)) va doanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te tai ky ((lang xa) OR (lang van)) hoi. hieu va ((tham luc) OR (than luc)) va doanh tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te tai ky ((lang xa) OR (lang van)) hoi. hieu va ((tham luc) or (than luc)) va doanh tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: te tai ky ((lang xa) OR (lang van)) hoi. hieu va ((tham luc) or (than luc)) va doanh tai cuu tre*.