Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dan vat » dang vat, van vat, dan dat
hieu va » lieu va, hieu qua
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
cac bac » cac bai, cac ban, cac cach
bac da » bac dai, bac dan, bac ha
dan va » doan va, dan ca, ban va
x hoi » xa hoi, o hoi, x ho

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) or (su sach)) ky nang x hoi. hieu va cac bac da ((dan vat) or (dan va)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x hoi. hieu va cac bac da ((dan vat) OR (dan va)) cua triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang x hoi. hieu va cac bac da ((dan vat) or (dan va)) cua triet*.