Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
quang hoi » quang huy, quan doi, quang tri
va quang » van quang, vu quang, va quan
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
van cac » van hac, van bac, dan cac
van cau » van dau, van hau, van chat
hoi cua » hoi chuc
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: thuat sach ky ((nang xa) OR (nang x)) hoi. hieu ((van cac) or (van cau)) nuoc va quang hoi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((nang xa) OR (nang x)) hoi. hieu ((van cac) OR (van cau)) nuoc va quang hoi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky ((nang xa) OR (nang x)) hoi. hieu ((van cac) or (van cau)) nuoc va quang hoi cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang xa) OR (nang x)) hoi. hieu ((van cac) or (van cau)) nuoc va quang hoi cua te*.