Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
canh trinh » canh tranh, hanh trinh, canh tinh
hoc thieu » toc thieu, hoc hien
trinh han » trinh quan
bong cong » cong cong, bang cong, bon cong
tong cong » trong cong, cong cong, dung cong
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac

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 sach - canh trinh han ((bong cong) or (tong cong)) ban ((than cau) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - canh trinh han ((bong cong) OR (tong cong)) ban ((than cau) OR (than cap)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - canh trinh han ((bong cong) or (tong cong)) ban ((than cau) or (than cap))*.