Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
va chat » van chat, va phat, hoa chat
tu sach » thu sach, su sach, tu cach
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
te sach » toc sach
ma hoi » mai hoi, xa hoi, ma hoa
loc va » hoc va, luc va
va va » va van, va vua, va vai

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) or (te sach)) ty nang ma hoi. hieu ((va chat) OR (cao chat)) loc va hanh va va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ty nang ma hoi. hieu ((va chat) OR (cao chat)) loc va hanh va va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ty nang ma hoi. hieu ((va chat) OR (cao chat)) loc va hanh va va triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ty nang ma hoi. hieu ((va chat) OR (cao chat)) loc va hanh va va triet*.