Perhaps you should try some spelling variations:
lanh tranh » canh tranh, lan tranh, sach tranh
hanh trinh » canh tranh, hanh chinh
hien cach » hien cac, hieu cach, thien hach
cua nhung » va nhung
thong van » trong van, thong quan, truong van
thong va » thong cua, truong va, thong qua
quan cu » quan cua, quang cu, quan cau

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 cach - ((lanh tranh) or (hanh trinh)) cua nhung ((thong van) OR (thong va)) quan cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien cach - ((lanh tranh) OR (hanh trinh)) cua nhung ((thong van) OR (thong va)) quan cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien cach - ((lanh tranh) or (hanh trinh)) cua nhung ((thong van) OR (thong va)) quan cu".
• Adding a wildcard symbol may retrieve word variants: hoc hien cach - ((lanh tranh) or (hanh trinh)) cua nhung ((thong van) OR (thong va)) quan cu*.