Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
thanh trung » thanh tung
thiet hach » thien hach, thuyet hach, thiet hai
phuong van » phung van, phong van, phuong lan
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trung va » truong va, trang va, trung ha
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet hach - thanh trung va nhung phuong van ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet hach - thanh trung va nhung phuong van ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc thiet hach - thanh trung va nhung phuong van ((toan cau) or (toan ban))*.