Perhaps you should try some spelling variations:
chat xuc » chat huu, cam xuc, chao xu
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
ve chat » va chat, van chat
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
va han » va phan, van han, va hang
tai va » thai va, mai va, tri va
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 ky ((nang xa) or (nang x)) hoi. hieu ve chat xuc ((va han) OR (va hanh)) tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (nang x)) hoi. hieu ve chat xuc ((va han) OR (va hanh)) tai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) or (nang x)) hoi. hieu ve chat xuc ((va han) OR (va hanh)) tai va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (nang x)) hoi. hieu ve chat xuc ((va han) OR (va hanh)) tai va thiet*.