Perhaps you should try some spelling variations:
tieu trinh » tien trinh, tien thinh, trieu tinh
nhung cong » dung cong, thong cong, hang cong
hanh tang » hanh trang, hanh mang, hanh tung
hoc tieu » hoc thieu, hoc dieu, hoc sieu
anh tang » anh bang, anh dang, anh nang
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc tieu trinh - ((hanh tang) or (anh tang)) va nhung cong ((tan toan) or (tap toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tieu trinh - ((hanh tang) OR (anh tang)) va nhung cong ((tan toan) OR (tap toan)) ban.
• Adding a wildcard symbol may retrieve word variants: hoc tieu trinh - ((hanh tang) or (anh tang)) va nhung cong ((tan toan) or (tap toan)) ban*.