Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
doanh van » doan van, doanh va, doanh ban
thu sach » tu sach, thuat sach, thuoc sach
quan cau » quang cao, toan cau, quan ha
sach ky » sac ky, sach y, sach ty
cau duc » cao duc, cau luc, chu duc
va hanh » van hanh, va thanh, va danh
vi cua » vai cua, di cua
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: thu sach ky ((doanh van) or (dinh van)) hoi. hieu quan cau duc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((doanh van) OR (dinh van)) hoi. hieu quan cau duc va hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((doanh van) or (dinh van)) hoi. hieu quan cau duc va hanh vi cua te*.