Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh tay » thanh tai, thanh toan, thanh thuy
thanh tap » thanh lap, thanh tai, thanh tam
su sach » so sach, vu sach
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky dang, ky tang, tay lang
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ky lang) or (ky nang)) hoa hoi. hieu ve cac duc va ((thanh tap) or (thanh tay)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky lang) OR (ky nang)) hoa hoi. hieu ve cac duc va ((thanh tap) OR (thanh tay)) cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach ((ky lang) or (ky nang)) hoa hoi. hieu ve cac duc va ((thanh tap) or (thanh tay)) cua triet*.