Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh dung » thanh duong, thanh tung, thanh hung
quan thanh » ban thanh, van thanh
quan hanh » quang thanh, quang khanh, quan hoang
thu sach » tu sach, thuoc sach, thu hoach
cong can » cong san, cong tan, cong dan
can chan » dan chan, cam chan, ban chan
chan cau » phan cau, can cau, chinh cau

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

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