Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
xuc van » duc van, luc van, xuc ban
va viet » hoa viet, san viet, mai viet
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
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: su sach ty nang x hoi. hieu ((ve cam) or (va cam)) xuc van hanh vi ((cua viet) or (va viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x hoi. hieu ((ve cam) OR (va cam)) xuc van hanh vi ((cua viet) OR (va viet)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x hoi. hieu ((ve cam) or (va cam)) xuc van hanh vi ((cua viet) or (va viet))*.