Perhaps you should try some spelling variations:
thieu hach » thien hach, chieu sach, hieu cach
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
tung cua » trung cua, tuong cua, dung cua
cong san » cong tac
san toan » van toan, dan toan, manh toan
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 thieu hach - thanh ((tung cua) or (dung cho)) thong cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu hach - thanh ((tung cua) OR (dung cho)) thong cong san toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc thieu hach - thanh ((tung cua) or (dung cho)) thong cong san toan ban*.