Perhaps you should try some spelling variations:
trung thanh » truong thanh
quoc trung » quoc hung, hoc trung, duc trung
thien van » thi van
bao quoc » bo quoc, cao quoc, han quoc
tu sach » thu sach, su sach, tu cach
tai cua » thai cua, tai cuc, tri cua
tai cuu » tai cuc, tai buu, thai cua
van bao » van ban, van dao
te sach » toc sach
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) y nang x hoi. thien van bao quoc trung thanh ((tai cuu) OR (tai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang x hoi. thien van bao quoc trung thanh ((tai cuu) OR (tai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) y nang x hoi. thien van bao quoc trung thanh ((tai cuu) OR (tai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) y nang x hoi. thien van bao quoc trung thanh ((tai cuu) OR (tai cua)) tre*.