Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
canh trang » hanh trang, banh trang, thanh trang
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tong cong » trong cong, dung cong, dang cong
cong cong » cong dong, trong cong, dung cong
tan phan » toan phan, than phan, van phan
phan cau » phan dau, phan cac, phan tu

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 tach - ((canh trang) OR (canh tranh)) va ((tong cong) OR (cong cong)) tan phan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet tach - ((canh trang) OR (canh tranh)) va ((tong cong) OR (cong cong)) tan phan cau".
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - ((canh trang) OR (canh tranh)) va ((tong cong) OR (cong cong)) tan phan cau*.