Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo chieu » theo tieu, ho chieu, theo chu
tuan dung » tuan duong, tan dung, tuan dang
tran dung » tran dang, tran hung, tran quang
tan nhanh » tai nhanh, tan nhan, tan thanh
nhanh cau » nhanh cay, thanh chau, nhanh ha
cong tan » cong tac, cong san, cong thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc hien) or (theo chieu)) sach - thanh trung ((tuan dung) OR (tran dung)) cong tan nhanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hien) OR (theo chieu)) sach - thanh trung ((tuan dung) OR (tran dung)) cong tan nhanh cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hien) or (theo chieu)) sach - thanh trung ((tuan dung) OR (tran dung)) cong tan nhanh cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc hien) or (theo chieu)) sach - thanh trung ((tuan dung) OR (tran dung)) cong tan nhanh cau*.