Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
hang di » hang doi, hang vi, hang dien
hanh di » hanh vi, hanh de, danh di
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
tuc va » thuc va, truc va, tuc xa
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang xa hoi. hieu ve cac ((duc va) or (tuc va)) ((hanh di) or (hang di)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. hieu ve cac ((duc va) OR (tuc va)) ((hanh di) OR (hang di)) va triet.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. hieu ve cac ((duc va) or (tuc va)) ((hanh di) or (hang di)) va triet*.