Perhaps you should try some spelling variations:
nuoc tren » thuoc tren
van hanh » van thanh, ban hanh, van anh
hanh lai » hanh lam, hanh tai, thanh lap
lai nuoc » li nuoc, lai cuoc, lai noc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky cong » ke cong, ly cong, khu cong
cong xa » cong xay, cong xua, cong ha
hieu ve » hieu van
hieu va » lieu va, hieu qua
cam vuc » cam xuc
vuc van » duc van, luc van, thuc van

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 ky cong xa hoi. ((hieu ve) or (hieu va)) cam vuc van hanh lai nuoc tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky cong xa hoi. ((hieu ve) OR (hieu va)) cam vuc van hanh lai nuoc tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky cong xa hoi. ((hieu ve) or (hieu va)) cam vuc van hanh lai nuoc tren*.