Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
dang mau » dang van, dang su, mang may
van hanh » van thanh, ban hanh, van anh
dong mau » dong ma, dong ha, dong tai
tham xuc » tham nuoc, tham thuc, pham duc
hanh ki » hanh vi, hanh ky, hanh kien
xuc van » duc van, luc van, vuc van
tu sach » thu sach, su sach, te sach
sach vu » sach va, sach tu, sach uu
ki su » ky su

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 vu ((dang mau) OR (dong mau)) hoi. ((lieu va) or (hieu qua)) tham xuc van hanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vu ((dang mau) OR (dong mau)) hoi. ((lieu va) OR (hieu qua)) tham xuc van hanh ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach vu ((dang mau) OR (dong mau)) hoi. ((lieu va) or (hieu qua)) tham xuc van hanh ki su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach vu ((dang mau) OR (dong mau)) hoi. ((lieu va) or (hieu qua)) tham xuc van hanh ki su triet*.