Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu hach » thien hach, chieu sach, hieu cach
trung tuan » trung thanh, trung tam, tran tuan
hoc thieu » toc thieu, hoc hien
nhung bo » nhung bi, nhung bai, nhung don
tan toan » tan tran, tap toan, van toan
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 hach - thanh trung tuan ((nhung bo) or (dung trong)) tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu hach - thanh trung tuan ((nhung bo) OR (dung trong)) tan toan cao*.