Perhaps you should try some spelling variations:
gian cac » gian dan, gian cua
ban hanh » ban hang
hanh tai » thanh tai, hang tai, han tai
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
xuc ban » duc ban, cuc ban, quoc ban
tai cua » thai cua, tai cuc, tri cua

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 xa hoi. hieu ((gian cac) or (vien bach)) xuc ban hanh tai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu ((gian cac) OR (vien bach)) xuc ban hanh tai cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ((gian cac) or (vien bach)) xuc ban hanh tai cua viet*.