Perhaps you should try some spelling variations:
trinh dai » trinh tai, trinh di, trinh da
hieu viec » nhieu viec, hieu ve, sieu viet
toc sach » hoc sach, doc sach, thuoc sach
tinh dai » tinh da, tinh doi, sinh dai
viec cam » viec lam, viec cua, viec va
tinh hai » tinh thai, tinh chat, trinh han
sach ky » sac ky, sach y, sach ty
cam tuc » cam xuc, cam tu, nam thuc
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa

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