Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
ngan nhung » ngan hang, gian nhung, nam nhung
cong thanh » dong thanh, cong trinh, truong thanh
hoc thien » hoc hien, hoc thieu, hoc thiet
cong manh » cong danh, duong manh, hoang manh
cong tan » cong tac, cong san, cong ty
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 thien hach - hanh chinh ngan nhung ((((cong manh) OR (cong thanh))) or (cong tan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - hanh chinh ngan nhung ((((cong manh) OR (cong thanh))) OR (cong tan)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thien hach - hanh chinh ngan nhung ((((cong manh) OR (cong thanh))) or (cong tan)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - hanh chinh ngan nhung ((((cong manh) OR (cong thanh))) or (cong tan)) toan cau*.