Perhaps you should try some spelling variations:
phuong tien » phuong trinh
theo chieu » theo tieu, ho chieu, theo chu
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhu phuong » thu phuong, nhung phuong, thi phuong
tien toan » thien toan, dien toan, tien thanh
toan tap » toan ban
manh va » hanh va, minh va, lanh va
anh va » hanh va

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu tinh - canh ((manh va) or (anh va)) nhu phuong tien toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu tinh - canh ((manh va) OR (anh va)) nhu phuong tien toan tap.
• Adding a wildcard symbol may retrieve word variants: theo chieu tinh - canh ((manh va) or (anh va)) nhu phuong tien toan tap*.