Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
nhung cong » dung cong, thong cong, hang cong
hieu cach » hieu cac, chieu sach, hieu ca
thanh han » thanh nhan, thanh hang, thanh san
hoc hieu » hoc thieu, hoc hien, doc hieu
hanh han » hanh nhan, hanh phan, hanh san
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu cach - ((hanh han) or (((thanh han) OR (thanh phan)))) va nhung cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - ((hanh han) OR (((thanh han) OR (thanh phan)))) va nhung cong san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu cach - ((hanh han) or (((thanh han) OR (thanh phan)))) va nhung cong san toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - ((hanh han) or (((thanh han) OR (thanh phan)))) va nhung cong san toan cau*.