Perhaps you should try some spelling variations:
thien dang » thien bang, thien danh, thien nang
hanh trinh » canh tranh, hanh chinh
dung huong » dung thuong, dung phuong, dong huong
hien hanh » dieu hanh
trinh cua » tinh cua, trinh luat, trinh quan
huong ban » huong dan, huong ben, huong lan
cua dung » cua dang, cua dong, qua dung
phan dau » phan tu, hang dau

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