Perhaps you should try some spelling variations:
thanh trung » thanh tung
phuong dinh » phuong binh, phuong linh, phuong trinh
thieu tinh » trieu tinh, chieu tinh, thien tinh
hoc thieu » toc thieu, hoc hien
dinh toan » tinh toan, hinh toan, minh toan
cua rung » cua trung, cua rang, cua truong
cua dang » cua cong, cua ban
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 thieu tinh - thanh trung ((cua rung) or (cua dang)) phuong dinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tinh - thanh trung ((cua rung) OR (cua dang)) phuong dinh toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu tinh - thanh trung ((cua rung) or (cua dang)) phuong dinh toan cau*.