Perhaps you should try some spelling variations:
hoach triet » hanh triet
thuong sach » thuong mach, duong sach, thuoc sach
tin thuong » ton thuong, dinh thuong, tin nguong
cac khoi » cac thoi, cac khoan, cach thoi
sach tin » sach tien, sach kinh, sach tren
hoc cac » hoc cao
khoi he » khoa he, khoi de, khong he
su sach » so sach, vu sach
nha tai » nhan tai, khau tai, chat tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu hoach triet hoc cac khoi he thong ) or ( su sach tin thuong sach nha tai cong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach triet hoc cac khoi he thong ) OR ( su sach tin thuong sach nha tai cong )).
• Adding a wildcard symbol may retrieve word variants: (( thu hoach triet hoc cac khoi he thong ) or ( su sach tin thuong sach nha tai cong ))*.