Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
hieu vien » hieu hien, hieu viec, thieu nien
hang hai » hoang hai, hang tai, thanh hai
vien cac » vien bach, vien dai, vien da
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
tu sach » thu sach, su sach, te sach
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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) or (thuoc sach)) y nang x hoi. hieu vien cac duc ban ((hang hai) or (hang va)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) y nang x hoi. hieu vien cac duc ban ((hang hai) OR (hang va)) cua triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) y nang x hoi. hieu vien cac duc ban ((hang hai) or (hang va)) cua triet*.