Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
trinh han » trinh quan
doc hieu » toc thieu, hoc thieu
cong dan » cong san, cong tan, huong dan
toan tap » toan ban
han tap » han tai, nhan tai, nhan tao
han va » hang va, hanh va, nhan va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (hoc hien)) manh - trinh han va nhung cong dan ((han tap) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc hien)) manh - trinh han va nhung cong dan ((han tap) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (hoc hien)) manh - trinh han va nhung cong dan ((han tap) or (toan tap))*.