Perhaps you should try some spelling variations:
ve triet » va trien
su triet » su viet, su tien
cam tuc » cam xuc, cam tu, nam thuc
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cao hoc » co hoc, cho hoc, chat hoc
cao hoi » cau hoi, co hoi, tao hoi
tuc va » thuc va, truc va, tuc xa
ve cam » ve cham, ve cac, va cam

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 nang ((cao hoi) OR (cao hoc)). hieu ve cam tuc va hanh va ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((cao hoi) OR (cao hoc)). hieu ve cam tuc va hanh va ((su triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((cao hoi) OR (cao hoc)). hieu ve cam tuc va hanh va ((su triet) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((cao hoi) OR (cao hoc)). hieu ve cam tuc va hanh va ((su triet) or (ve triet))*.