Perhaps you should try some spelling variations:
doanh dai » doanh tai, doanh dao, doanh giai
ban doanh » van doanh, san doanh, ban danh
cua triet » cua viet, su triet, va triet
cham duc » pham duc, cham soc, pham duy
te sach » toc sach
dao tay » dao tao, dan tay
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, dua tren

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y ((dung tai) or (dao tay)) hoi. hieu ve cham duc ban doanh dai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((dung tai) OR (dao tay)) hoi. hieu ve cham duc ban doanh dai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((dung tai) or (dao tay)) hoi. hieu ve cham duc ban doanh dai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach y ((dung tai) or (dao tay)) hoi. hieu ve cham duc ban doanh dai ((cua tre) OR (cua triet))*.