Perhaps you should try some spelling variations:
thi canh » thi hanh, thi anh, thi oanh
va triet » va trien, ve triet, cua triet
tu cach » tu cac
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
canh xa » canh va, canh tac, canh tay
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
hanh va » hang va, hanh vi
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (su sach)) thi canh xa hoi. hieu ve cac tuc va hanh va ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) thi canh xa hoi. hieu ve cac tuc va hanh va ((va triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) thi canh xa hoi. hieu ve cac tuc va hanh va ((va triet) or (va thiet))*.