Perhaps you should try some spelling variations:
may trinh » may tinh, lap trinh, quy trinh
trinh van » trinh han, trinh quan, trinh toan
thu sach » tu sach, thuat sach, thuoc sach
mai hoi » mai khoi, lai hoi, mai doi
van cua » vang cua, ban cua, dan cua
dai hoi » dai hoc, dai hai, dai moi
sach ky » sac ky, sach y, sach ty
hoc may » hoc ma
ve tao » ve bao, ve tac, ve tai
de tao » de dao, de tai, de tro
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 nang ((mai hoi) OR (dai hoi)). hieu ((ve tao) or (de tao)) hoc may trinh van cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((mai hoi) OR (dai hoi)). hieu ((ve tao) OR (de tao)) hoc may trinh van cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((mai hoi) OR (dai hoi)). hieu ((ve tao) or (de tao)) hoc may trinh van cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((mai hoi) OR (dai hoi)). hieu ((ve tao) or (de tao)) hoc may trinh van cua te*.