Perhaps you should try some spelling variations:
tran nhung » tranh nhung, tran hung, tren nhung
nhung cong » dung cong, thong cong, hang cong
quan tran » quang tran, quan tren, xuan tran
doc hieu » toc thieu, hoc thieu, hoc hien
ho chieu » theo chieu, hoc thieu, mot chieu
anh quan » anh tuan, ban quan, anh nhan
cong tap » cuong tap, cong tac, cong tan
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (ho chieu)) sach - anh quan tran nhung cong tap ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (ho chieu)) sach - anh quan tran nhung cong tap ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (ho chieu)) sach - anh quan tran nhung cong tap ((toan cau) or (toan tap))*.