Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thu sach » tu sach, thuoc sach, thu hoach
va triet » va thiet, va trien, ve triet
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
minh cu » minh cau, dinh cu, minh tu
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, 5 hoi
cu va » cuu va, tu va, su va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (thuat sach)) y nang ((x hoi) OR (x ho)). hieu ve cac duc van minh cu va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) y nang ((x hoi) OR (x ho)). hieu ve cac duc van minh cu va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuat sach)) y nang ((x hoi) OR (x ho)). hieu ve cac duc van minh cu va triet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuat sach)) y nang ((x hoi) OR (x ho)). hieu ve cac duc van minh cu va triet*.