Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh tai » thanh tai, hang tai, hinh tai
sach ky » sac ky, sach y, sach ty
han tai » hang tai, nhan tai, van tai
su sach » so sach, vu sach
cam tuc » cam tu, nam thuc, dam thuc
hieu va » lieu va, hieu qua
sang xa » song xa, lang xa, sang ma
ky sang » ky nang, ky dang, ky tang

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

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