Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
dang thanh » dong thanh, dang hanh, hoang thanh
khau sach » khoa sach, pham sach, cau sach
dang cong » dung cong
dang tran » quang tran, hoang tran, dang van
hau sach » cau sach, ham sach, rau sach
trinh va » trinh van, trinh vat, trinh ve
va dang » van dang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: thau ((khau sach) OR (hau sach)) - hanh trinh va dang cong ((dang tran) or (dang thanh)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thau ((khau sach) OR (hau sach)) - hanh trinh va dang cong ((dang tran) OR (dang thanh)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thau ((khau sach) OR (hau sach)) - hanh trinh va dang cong ((dang tran) or (dang thanh)) cao".
• Adding a wildcard symbol may retrieve word variants: thau ((khau sach) OR (hau sach)) - hanh trinh va dang cong ((dang tran) or (dang thanh)) cao*.