Perhaps you should try some spelling variations:
hanh lam » thanh lap, hanh kem, hanh va
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ve cam » ve cham, va cam, ve cai
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) or (nang cao)) hoi. hieu ((ve cam) OR (ve cac)) duc va hanh lam va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (nang cao)) hoi. hieu ((ve cam) OR (ve cac)) duc va hanh lam va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) or (nang cao)) hoi. hieu ((ve cam) OR (ve cac)) duc va hanh lam va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (nang cao)) hoi. hieu ((ve cam) OR (ve cac)) duc va hanh lam va thiet*.