Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
bo sach » co sach, hoc sach
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
hanh ca » hanh cac, hanh cat, hanh cua
ma hoi » mai hoi, xa hoi, ma hoa
ca cua » co cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((bo sach) or (te sach)) ky nang ma hoi. hieu van nam ((xuc van) OR (duc van)) hanh ca cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((bo sach) OR (te sach)) ky nang ma hoi. hieu van nam ((xuc van) OR (duc van)) hanh ca cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bo sach) or (te sach)) ky nang ma hoi. hieu van nam ((xuc van) OR (duc van)) hanh ca cua triet".
• Adding a wildcard symbol may retrieve word variants: ((bo sach) or (te sach)) ky nang ma hoi. hieu van nam ((xuc van) OR (duc van)) hanh ca cua triet*.