Perhaps you should try some spelling variations:
trong thang » trong tang, trong thanh, trong trang
chieu tinh » trieu tinh, lieu tinh, chau tinh
toan thuc » toan hoc, dan thuc, nhan thuc
thuc dung » thuoc dung, thuy dung, tuc dung
ho chieu » theo chieu, hoc thieu, mot chieu
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu tinh - tinh toan thuc dung trong thang ((phan lap) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu tinh - tinh toan thuc dung trong thang ((phan lap) OR (phan dau)).
• Adding a wildcard symbol may retrieve word variants: ho chieu tinh - tinh toan thuc dung trong thang ((phan lap) or (phan dau))*.