Perhaps you should try some spelling variations:
thien hieu » thien nhien, thien chien, thien hue
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, thong thong
hieu quan » hieu qua, lieu quan, thien quan
trinh va » trinh van, trinh vat, trinh ve
va thong » va thuong, va phuong, he thong
cong dan » cong san, cong tan, huong dan
than cua » nhan cua, thai cua, ban cua
khan cap » khan ap, than cap, khoan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: thien hieu quan - hanh trinh va thong cong dan ((than cua) or (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thien hieu quan - hanh trinh va thong cong dan ((than cua) OR (khan cap)).
• Adding a wildcard symbol may retrieve word variants: thien hieu quan - hanh trinh va thong cong dan ((than cua) or (khan cap))*.