Perhaps you should try some spelling variations:
duc thuan » duc tan, duc thang, duc phan
xuc tuan » quoc tuan, xuan tuan, duc tan
su sach » so sach
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
vu sach » vu bach, vu khach
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di cua
cua su » qua su

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 (vu sach)) ky sang ma hoi. hieu ve cam ((xuc tuan) OR (duc thuan)) anh vi cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky sang ma hoi. hieu ve cam ((xuc tuan) OR (duc thuan)) anh vi cua su*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ky sang ma hoi. hieu ve cam ((xuc tuan) OR (duc thuan)) anh vi cua su*".