Perhaps you should try some spelling variations:
thanh gian » thanh giang, thach giang, thanh san
cua triet » cua viet, su triet, va triet
hanh gia » danh gia, hinh giao, canh giac
cac duc » cac du, cao duc, cac dac
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
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) or (sach y)) nang x hoi. hieu ve cac duc va ((hanh gia) OR (thanh gian)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang x hoi. hieu ve cac duc va ((hanh gia) OR (thanh gian)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) nang x hoi. hieu ve cac duc va ((hanh gia) OR (thanh gian)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang x hoi. hieu ve cac duc va ((hanh gia) OR (thanh gian)) cua triet*.