Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
nang xa » nang x, lang xa, nang ma
sach ky » sach y, sach ty, sach kem
xuc van » duc van, luc van, xuc ban
ve cham » va cham, ve chat, vu cham
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc ((sach ky) OR (sac ky)) nang xa hoi. hieu ((ve cham) or (ve cac)) xuc van hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc ((sach ky) OR (sac ky)) nang xa hoi. hieu ((ve cham) OR (ve cac)) xuc van hanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc ((sach ky) OR (sac ky)) nang xa hoi. hieu ((ve cham) or (ve cac)) xuc van hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: thuoc ((sach ky) OR (sac ky)) nang xa hoi. hieu ((ve cham) or (ve cac)) xuc van hanh vi cua viet*.