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