Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh lam » thanh lap, hanh kem, hanh va
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
duc van » duc va, duc tan, duc manh
va cam » va cham, va cac, va cao
ve cac » va cac, vien cac
lam va » nam va, dam va, lam ha
thiet » thieu

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 xa hoi. hieu ((va cam) or (ve cac)) duc van hanh lam va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu ((va cam) OR (ve cac)) duc van hanh lam va thiet.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu ((va cam) or (ve cac)) duc van hanh lam va thiet*.