Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
trinh han » trinh quan
toan cao » toan tap
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 han ((nhung cong) OR (thong cong)) manh ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh trinh han ((nhung cong) OR (thong cong)) manh ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sach - hanh trinh han ((nhung cong) OR (thong cong)) manh ((toan cao) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh trinh han ((nhung cong) OR (thong cong)) manh ((toan cao) or (toan ban))*.