Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
thanh lap » thanh san, phan lap, thanh hai
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
va thanh » gia thanh, ban thanh, va tinh
va triet » va thiet, va trien, ve triet
te sach » toc sach
sach ky » sac ky, sach y, sach ty
co hai » co dai, co hoi, so hai
o hai » so hai, o lai, _ hai

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 ky nang ((o hai) or (co hai)). hieu van pham duc va thanh lap ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((o hai) OR (co hai)). hieu van pham duc va thanh lap ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((o hai) or (co hai)). hieu van pham duc va thanh lap ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((o hai) or (co hai)). hieu van pham duc va thanh lap ((cua triet) OR (va triet))*.