Perhaps you should try some spelling variations:
trien viet » tieng viet
cam hoang » cap hoang, cau hoang, pham hoang
dien viet » tieng viet, gian viet, dien bien
cam doan » chan doan, cac doanh, cao doanh
cac xuc » cam xuc, cac nuoc, chat xuc
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu
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 nang x hoi. ((dien viet) or (trien viet)) cac xuc ((cam doan) OR (cam hoang)) vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x hoi. ((dien viet) OR (trien viet)) cac xuc ((cam doan) OR (cam hoang)) vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang x hoi. ((dien viet) or (trien viet)) cac xuc ((cam doan) OR (cam hoang)) vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x hoi. ((dien viet) or (trien viet)) cac xuc ((cam doan) OR (cam hoang)) vi cuu tre*.