Perhaps you should try some spelling variations:
duong thanh » dong thanh, muong thanh, dung thanh
luong thanh » muong thanh, truong thanh, dong thanh
manh trung » manh tung, thanh trung, manh hung
hoc chieu » hoc thieu, hoc hien, hoc dieu
trung tac » trung tam, trong tac, trung tai
ho chieu » theo chieu, hoc thieu, doi chieu
tac dung » sach dung, xay dung, tin dung
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc chieu) OR (ho chieu)) tinh - manh trung tac dung ((duong thanh) or (luong thanh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chieu) OR (ho chieu)) tinh - manh trung tac dung ((duong thanh) OR (luong thanh)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chieu) OR (ho chieu)) tinh - manh trung tac dung ((duong thanh) or (luong thanh)) toan cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc chieu) OR (ho chieu)) tinh - manh trung tac dung ((duong thanh) or (luong thanh)) toan cau*.