Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang mai » nang ma, nang tai, lang mai
lang tai » lang thai, hang tai, tang tai
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu van
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
va lang » va nang, hoa lang
tai cua » thai cua, tai cuc, tri cua
y nang » ky nang, ly nang, v nang

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 y nang mai hoi. ((hieu ve) OR (hieu va)) cau truc va lang tai cua triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang mai hoi. ((hieu ve) or (hieu va)) cau truc va lang tai cua triet*.