Perhaps you should try some spelling variations:
thiet danh » thien danh, thien anh, thien dang
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trang cua » tranh cua, trung cua, thang cua
tang cua » mang cua, hang cua, tang luan
cong van » cong vang, cong san, song van
tan cau » toan cau, van cau, tao cau
tan ca » tan cua, tang ca, dan ca

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 - hanh ((trang cua) OR (tang cua)) nhung cong van ((tan cau) or (tan ca))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet danh - hanh ((trang cua) OR (tang cua)) nhung cong van ((tan cau) OR (tan ca)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet danh - hanh ((trang cua) OR (tang cua)) nhung cong van ((tan cau) or (tan ca))".
• Adding a wildcard symbol may retrieve word variants: hoc thiet danh - hanh ((trang cua) OR (tang cua)) nhung cong van ((tan cau) or (tan ca))*.