Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, vien da
hieu cac » hieu luc, hieu va, hieu van
va hanh » va thanh, va danh, ban hanh
nang ma » tang ma, sang ma, nang cao
te sach » toc sach
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
van su » dan su

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

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