Perhaps you should try some spelling variations:
thong minh » hoang minh
khach che » hanh che
giai toan » giai doan, giai toa, gioi toan
ban thong » ban trong, ban tuong, ban tong
thu sach » tu sach, thuat sach, thuoc sach
sach che » sach thue, sach nha, sach cap
vu khach » vu khanh, vu khac, vay khach
gioi ban » gioi van, gioi bon, gioi can
ve giai » va giai, ve giao, de giai
me gioi » me giai, ve gioi, me nguoi
che ve » chep ve, che va, che vi
che me » che my

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 che ve giai toan thong tin ) or ( vu khach che me gioi ban thong minh ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach che ve giai toan thong tin ) OR ( vu khach che me gioi ban thong minh )).
• Adding a wildcard symbol may retrieve word variants: (( thu sach che ve giai toan thong tin ) or ( vu khach che me gioi ban thong minh ))*.