Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
hanh hai » thanh hai, nhanh hai, hang hai
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
hai cua » thai cua, dai cua, hoi cua
sai ky » sac ky
ve cac » va cac, vien cac
cac lo » cac lop, cac co, cac bo
lo van » le van, vo van, so van

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sai ky)) nang xa hoi. hieu ve cac lo van hanh hai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sai ky)) nang xa hoi. hieu ve cac lo van hanh hai cua triet.
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sai ky)) nang xa hoi. hieu ve cac lo van hanh hai cua triet*.