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
vu cham » va cham, vu kham, tu cham
sach ky » sach y, sach ty, sach kem
xuc van » duc van, luc van, xuc ban
hanh di » hanh vi, hanh de, hang di
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
di cua » dai cua, doi cua, de cua

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

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