Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
vien dai » hien dai
vien cac » vien bach, vien da, gian cac
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
va tinh » may tinh
tinh ki » trinh ki, tinh vi, tinh kien
tu sach » thu sach, su sach, te sach
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 ((ty nang) OR (ty hang)) x ho. hieu ((vien cac) or (vien dai)) nuoc va tinh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty hang)) x ho. hieu ((vien cac) OR (vien dai)) nuoc va tinh ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ty hang)) x ho. hieu ((vien cac) or (vien dai)) nuoc va tinh ki su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ty hang)) x ho. hieu ((vien cac) or (vien dai)) nuoc va tinh ki su triet*.