Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cac khoi » cac thoi, cac khoan, cach thoi
danh vai » danh sai, doanh van, dang van
cau tren » cu tren, dau tren, ca tren
lai hoi » dai hoi, lai hoa, lai roi
sach ty » sach y, sach tu, sach thu
ty tang » tay tang, ty xang, ty hang
danh va » doanh va, hanh va, anh va
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va

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 ty tang ((lai hoi) or (cac khoi)). hieu ve cam xuc va ((danh vai) OR (danh va)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty tang ((lai hoi) OR (cac khoi)). hieu ve cam xuc va ((danh vai) OR (danh va)) cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty tang ((lai hoi) or (cac khoi)). hieu ve cam xuc va ((danh vai) OR (danh va)) cau tren*".