Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
trang tuan » tran tuan, trung tuan, trong tuan
hoc thieu » hoc hien
tong cong » trong cong, cong cong, dang cong
dung cong » dung trong
tap toan » tap doan, tap quan, bai toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thieu) or (toc thieu)) tinh - hanh trang tuan ((tong cong) OR (dung cong)) tap toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (toc thieu)) tinh - hanh trang tuan ((tong cong) OR (dung cong)) tap toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (toc thieu)) tinh - hanh trang tuan ((tong cong) OR (dung cong)) tap toan ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (toc thieu)) tinh - hanh trang tuan ((tong cong) OR (dung cong)) tap toan ban*.