Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
vanh tai » van tai, hanh tai, anh tai
cham xuc » cam xuc, chat xuc, cham soc
va vanh » va van, va danh, va hanh
va cham » va chat, va tham
hieu va » lieu va, hieu qua
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
xuc va » duc va, tuc va, luc va
tai su » tai so, tai tu, lai su
o hoi » co hoi, o hai, o hoa
o hoc » co hoc, mo hoc, so hoc

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang ((o hoi) OR (o hoc)). hieu va cham xuc va vanh tai su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang ((o hoi) OR (o hoc)). hieu va cham xuc va vanh tai su triet~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang ((o hoi) OR (o hoc)). hieu va cham xuc va vanh tai su triet*.