Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
van hanh » van thanh, ban hanh, van anh
hanh hai » thanh hai, nhanh hai, hang hai
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
cac so » cac co, cac bo, cac ho
so van » su van, vo van
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 ky nang x hoi. hieu ve cac so van hanh hai ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ve cac so van hanh hai ((cua triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ve cac so van hanh hai ((cua triet) or (su triet))*.