Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
luc ban » duc ban, cuc ban, luc bat
cau luc » cau truc, cau phuc
van cau » van dau, van hau, van chat
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky dung » ly dung, ky dang, ky vung
ha hoi » ha noi, xa hoi, va hoi
cua te » cua tu

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) or (thu hoach)) ky dung ((ha hoi) OR (hoa hoi)). hieu van cau luc ban hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu hoach)) ky dung ((ha hoi) OR (hoa hoi)). hieu van cau luc ban hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thu hoach)) ky dung ((ha hoi) OR (hoa hoi)). hieu van cau luc ban hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu hoach)) ky dung ((ha hoi) OR (hoa hoi)). hieu van cau luc ban hanh vai cua te*.