Perhaps you should try some spelling variations:
vien cac » vien dai, gian cac, vien va
su triet » su viet, su tien, ve triet
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
vien da » vien dai, hien dai
va tinh » may tinh
tinh vi » trinh vi, tinh voi, tinh va
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang x ho. hieu ((((vien cac) OR (vien da))) or (vien bach)) nuoc va tinh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang x ho. hieu ((((vien cac) OR (vien da))) OR (vien bach)) nuoc va tinh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang x ho. hieu ((((vien cac) OR (vien da))) or (vien bach)) nuoc va tinh vi su triet".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang x ho. hieu ((((vien cac) OR (vien da))) or (vien bach)) nuoc va tinh vi su triet*.