Perhaps you should try some spelling variations:
tinh viet » trinh viet, ninh viet, dinh viet
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
viet cua » viec cua, viet ca, viet qua
te sach » toc sach
ty nang » ty hang, ly nang, ty nong
hieu ve » hieu va, hieu van
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((((ty nang) or (ty xang))) or (ky nang)) xa hoi. hieu ve cac nuoc va tinh viet cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((((ty nang) OR (ty xang))) OR (ky nang)) xa hoi. hieu ve cac nuoc va tinh viet cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((((ty nang) or (ty xang))) or (ky nang)) xa hoi. hieu ve cac nuoc va tinh viet cua tre*.