Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
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
ca viet » va viet, co viet, hoa viet
ve cai » va cai, ve cac, ve tai
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 cai) or (va cam)) xuc van hanh vi ((cua vat) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x hoi. hieu ((ve cai) OR (va cam)) xuc van hanh vi ((cua vat) OR (ca viet)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x hoi. hieu ((ve cai) or (va cam)) xuc van hanh vi ((cua vat) or (ca viet))*.