Perhaps you should try some spelling variations:
khang tai » hang tai, khau tai, han tai
va triet » va thiet, va trien, ve triet
nhan tai » hang tai, van tai, toan tai
sach ky » sac ky, sach y, sach ty
so sach » so sanh, bo sach, co sach
cam tuc » cam tu, nam thuc, dam thuc
hieu va » lieu va, hieu qua
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky sang ma hoi. hieu va ((cam tuc) or (cam xuc)) van ((khang tai) OR (nhan tai)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky sang ma hoi. hieu va ((cam tuc) OR (cam xuc)) van ((khang tai) OR (nhan tai)) va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky sang ma hoi. hieu va ((cam tuc) or (cam xuc)) van ((khang tai) OR (nhan tai)) va triet*".