Perhaps you should try some spelling variations:
dung huong » dung thuong, dung phuong, dong huong
thien dang » thien bang, thien danh, thien nang
hien hanh » dieu hanh
hanh sinh » hanh tinh, hanh dinh, hinh sinh
huong ban » huong dan, huong ben, huong lan
sinh cua » manh cua, dinh cuu, sinh va
cua dung » cua dang, cua dong, qua dung
than lap » thanh lap, phan lap, thao lap
toan lap » toan tap, toan lao, thanh lap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien hanh) or (thien dang)) - hanh sinh cua dung huong ban ((than lap) OR (toan lap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien hanh) OR (thien dang)) - hanh sinh cua dung huong ban ((than lap) OR (toan lap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien hanh) or (thien dang)) - hanh sinh cua dung huong ban ((than lap) OR (toan lap))".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien hanh) or (thien dang)) - hanh sinh cua dung huong ban ((than lap) OR (toan lap))*.