Perhaps you should try some spelling variations:
chung luong » hung luong, thuong luong, chuong duong
chieu sach » chinh sach, chiet tach, chieu sang
hieu cach » hieu cac, hieu ca, biet cach
luong tai » dung tai, luong va
mang cua » dung cua, ban cua, cong cua
manh cua » doanh cua, ban cua
tai quan » tai quang, hai quan, mai quan
quan tap » quan tai, quan lap, quan tam

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu cach) or (chieu sach)) - hanh ((mang cua) OR (manh cua)) chung luong tai quan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu cach) OR (chieu sach)) - hanh ((mang cua) OR (manh cua)) chung luong tai quan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu cach) or (chieu sach)) - hanh ((mang cua) OR (manh cua)) chung luong tai quan tap".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu cach) or (chieu sach)) - hanh ((mang cua) OR (manh cua)) chung luong tai quan tap*.