Perhaps you should try some spelling variations:
dien viet » tieng viet, trien viet, gian viet
viet cac » vien cac, viet ca, viet bac
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cac xuc » cam xuc, cac nuoc, chat xuc
xuc cam » phuc cam
doan vi » don vi, doan thi, doan van
cuu tre » cua tre, cau tren, cau treo
x hoi » xa hoi, o hoi, 5 hoi

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 nang ((x hoi) or (x ho)). dien viet cac xuc cam ((doan vi) OR (doan va)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((x hoi) OR (x ho)). dien viet cac xuc cam ((doan vi) OR (doan va)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ((x hoi) or (x ho)). dien viet cac xuc cam ((doan vi) OR (doan va)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((x hoi) or (x ho)). dien viet cac xuc cam ((doan vi) OR (doan va)) cuu tre*.