Perhaps you should try some spelling variations:
trinh dai » trinh tai, trinh da, trinh dan
hieu viec » nhieu viec, hieu ve, sieu viet
toc sach » hoc sach, doc sach, thuoc sach
viec cam » viec lam, viec cua, viec va
tinh dai » tinh da, tinh hai, tinh doi
trinh di » trinh do, trinh dien, trinh dinh
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky lang xa hoi. hieu viec cam xuc va ((tinh dai) or (((trinh dai) OR (trinh di)))) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang xa hoi. hieu viec cam xuc va ((tinh dai) OR (((trinh dai) OR (trinh di)))) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky lang xa hoi. hieu viec cam xuc va ((tinh dai) or (((trinh dai) OR (trinh di)))) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. hieu viec cam xuc va ((tinh dai) or (((trinh dai) OR (trinh di)))) cua tre*.