Perhaps you should try some spelling variations:
trien viet » tieng viet
viet cac » vien cac, viet ca, viet bac
cam doan » chan doan, cac doanh, cam hoang
xuc cam » phuc cam
thi cuc » tai cuc
thi cua » thai cua, tri cua, thi dua
cac xuc » cam xuc, cac nuoc, chat xuc
sach ty » sach tu, sach thu, xach tay
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: su ((sach ty) OR (sach y)) nang x hoi. trien viet cac xuc cam doan ((thi cua) or (thi cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang x hoi. trien viet cac xuc cam doan ((thi cua) OR (thi cuc)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach y)) nang x hoi. trien viet cac xuc cam doan ((thi cua) or (thi cuc)) tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) OR (sach y)) nang x hoi. trien viet cac xuc cam doan ((thi cua) or (thi cuc)) tre*.