Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc chieu » hoc thieu, hoc hien, hoc dieu
hanh manh » hanh mang, lanh manh, hoang manh
ho chieu » theo chieu, hoc thieu, doi chieu
cong tac » cong ty
toan tap » toan ban
manh va » hanh va, anh va, minh va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (ho chieu)) xanh - hanh manh va nhung cong tac ((toan tap) OR (van ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) OR (ho chieu)) xanh - hanh manh va nhung cong tac ((toan tap) or (van ban))~".
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) OR (ho chieu)) xanh - hanh manh va nhung cong tac ((toan tap) or (van ban))*.