Perhaps you should try some spelling variations:
van thuat » va thuat, van thuan, van tuan
thien van » thi van
thuat doc » thuat duoc, thuat do, thuat doi
cua triet » cua viet, su triet, va triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
dau cua » dai cua, day cua, cau cua
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: tu sach ky nang ((x hoi) OR (x ho)). thien van thuat doc ((va danh) or (va hanh)) dau cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((x hoi) OR (x ho)). thien van thuat doc ((va danh) OR (va hanh)) dau cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((x hoi) OR (x ho)). thien van thuat doc ((va danh) or (va hanh)) dau cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((x hoi) OR (x ho)). thien van thuat doc ((va danh) or (va hanh)) dau cua triet*.