Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
hoc hieu » hoc thieu, hoc hien, doc hieu
trang va » tran van, hang va
trinh ve » trinh he, trinh va, trinh vi
cong san » cong tac
chon tu » con tu, cho tu, choi tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu manh - canh ((trang va) or (trinh ve)) nhung cong san ((chon tu) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh ((trang va) OR (trinh ve)) nhung cong san ((chon tu) OR (phan tu)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh ((trang va) or (trinh ve)) nhung cong san ((chon tu) or (phan tu))*.