Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
cach giao » sach giao, cac giai, anh giao
dung cong » dung trong
toc hieu » toc thieu, doc hieu, hoc thieu
cach van » cac van, bach van, canh van
cua dung » cua dang, cua dong, qua dung
san phan » san pham, van phan, sat phan
vat phan » va phan, van phan, sat phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc hieu manh - ((cach van) or (cach giao)) cua dung cong ((san phan) or (vat phan)) lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc hieu manh - ((cach van) OR (cach giao)) cua dung cong ((san phan) OR (vat phan)) lap.
• Adding a wildcard symbol may retrieve word variants: toc hieu manh - ((cach van) or (cach giao)) cua dung cong ((san phan) or (vat phan)) lap*.