Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hien cac » thien cac, hieu cac, dien cac
vien cac » vien bach, vien dai, vien da
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
sach ty » sach y, sach tu, sach thu
te sach » toc sach
ma hoi » mai hoi, xa hoi, ma hoa
va dan » ca dan, va dau, va dap
va dao » ca dao
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 ty nang ma hoi. thien ((hien cac) or (vien cac)) xuc ((va dan) OR (va dao)) van su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ma hoi. thien ((hien cac) OR (vien cac)) xuc ((va dan) OR (va dao)) van su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ma hoi. thien ((hien cac) or (vien cac)) xuc ((va dan) OR (va dao)) van su triet".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ma hoi. thien ((hien cac) or (vien cac)) xuc ((va dan) OR (va dao)) van su triet*.