Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh tai, hanh van
hanh va » hang va, hanh vi
tuc van » thuc van, truc van, tuc va
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ky dang » ky danh
cac tuc » cac toc, cac tu, cac tac
ve cac » va cac, vien cac

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 ((ky dang) or (ky nang)) xa hoi. hieu ve cac tuc van ((hanh vai) or (hanh va)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky dang) OR (ky nang)) xa hoi. hieu ve cac tuc van ((hanh vai) OR (hanh va)) cua viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky dang) or (ky nang)) xa hoi. hieu ve cac tuc van ((hanh vai) or (hanh va)) cua viet*.