Perhaps you should try some spelling variations:
tan hanh » tan thanh, tang hanh, toan hanh
cham duc » pham duc, cham soc, pham duy
hanh dai » hanh tai, hanh dao, vanh dai
va triet » va thiet, va trien, ve triet
su cach » tu cach, su cac, cuu cach
su sach » so sach, vu sach
tu nang » tru nang, tu nong, tu nano
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
dai va » mai va
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su cach) OR (su sach)) tu nang ((x hoi) or (x ho)). hieu ve cham duc tan hanh dai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su cach) OR (su sach)) tu nang ((x hoi) OR (x ho)). hieu ve cham duc tan hanh dai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su cach) OR (su sach)) tu nang ((x hoi) or (x ho)). hieu ve cham duc tan hanh dai va triet".
• Adding a wildcard symbol may retrieve word variants: ((su cach) OR (su sach)) tu nang ((x hoi) or (x ho)). hieu ve cham duc tan hanh dai va triet*.