Perhaps you should try some spelling variations:
luong thanh » muong thanh, truong thanh, dong thanh
thiet danh » thien danh, thien anh, thien dang
minh thang » minh hang, minh trang, dinh thang
dung luong » dung thuong, dung phuong, dung truong
thanh phan » thanh pho, thanh san, thanh toan
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tinh nhan » trinh nhan, tinh than, minh nhan
ninh nhan » minh nhan, ninh thuan, ninh thanh
thuc dung » thuoc dung, thuy dung, tuc 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 thiet danh - ((((tinh nhan) or (ninh nhan))) or (minh thang)) thuc dung luong thanh phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet danh - ((((tinh nhan) OR (ninh nhan))) OR (minh thang)) thuc dung luong thanh phan dau.
• Adding a wildcard symbol may retrieve word variants: hoc thiet danh - ((((tinh nhan) or (ninh nhan))) or (minh thang)) thuc dung luong thanh phan dau*.