Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
quan nhung » qua nhung, cua nhung, luan chung
hoc thieu » toc thieu, hoc hien
cong manh » cong danh, duong manh, cong thanh
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan tap, toan tai
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 sach - hanh trinh quan nhung ((cong manh) or (cong tan)) ((toan cau) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh trinh quan nhung ((cong manh) OR (cong tan)) ((toan cau) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hanh trinh quan nhung ((cong manh) or (cong tan)) ((toan cau) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh trinh quan nhung ((cong manh) or (cong tan)) ((toan cau) OR (toan ban))*.