Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
ban hanh » ban hang
vien cac » vien bach, vien dai, vien da
sach ty » sach y, sach tu, sach thu
xuc ban » duc ban, cuc ban, quoc ban
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
ve cam » ve cham, va cam, ve cai
kem va » kiem va, kiem van
ve cac » va cac
x hoi » xa hoi, o hoi, x ho

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