Perhaps you should try some spelling variations:
sach nham » sach nha, sach tham, sach han
nham nang » phap nang, cam nang, kha nang
vu triet » su triet, ve triet, va triet
hanh lam » thanh lap, hanh kem, hanh va
van hanh » van thanh, ban hanh, van anh
mai khoi » mai khoa, tai khoa, cac khoi
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, te sach
ve cac » vien cac
ma hoi » mai hoi, xa hoi, ma hoa
lam vu » sam vu

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

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