Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
dang xay » dang van, van xay
sach ty » sach y, sach tu, sach thu
luc van » luoc van, luu van, duc van
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
hieu ve » hieu van
lang xa » lang ha, lang van
lai va » loai va, mai va, dai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty ((lang xa) or (dang xay)) hoi. ((hieu ve) or (hieu va)) cam luc van hanh lai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((lang xa) OR (dang xay)) hoi. ((hieu ve) OR (hieu va)) cam luc van hanh lai va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((lang xa) or (dang xay)) hoi. ((hieu ve) or (hieu va)) cam luc van hanh lai va triet*.