Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh han » trinh quan
sach tren » sach tien, sach tranh
tren cong » trien cong, tien cong, tran cong
cong khi » cong thai, khong khi, co khi
su hanh » su thanh, du hanh, lu hanh
han khi » ban khi, van khi, than khai
vu sach » vu bach, su sach, vu khach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su hanh trinh han khi đong luc ) or ( vu sach tren cong khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su hanh trinh han khi đong luc ) OR ( vu sach tren cong khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( su hanh trinh han khi đong luc ) or ( vu sach tren cong khi đong luc ))*.