Perhaps you should try some spelling variations:
thien van » thi van
va trien » va truyen, va thiet, va tuyen
van hanh » van thanh, ban hanh, van anh
nam quan » nam huan, nam qua, sam quan
va triet » va thiet, ve triet, cua triet
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
nam mua » nam cua, nam qua, nam xua
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. thien van ((nam quan) or (nam mua)) van hanh dai ((va triet) OR (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. thien van ((nam quan) OR (nam mua)) van hanh dai ((va triet) OR (va trien))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. thien van ((nam quan) or (nam mua)) van hanh dai ((va triet) OR (va trien))*".