Perhaps you should try some spelling variations:
nhieu viec » nhien viet
hieu viec » hieu ve, sieu viet, hieu hien
thu sach » tu sach, thuat sach, thuoc sach
trinh de » trinh den, trinh do, trinh he
va trinh » van trinh, va tinh, lap trinh
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
su sach » so sach, vu sach
cam tu » cam thu, nam tu, dam tu
de cua » le cua, te cua, dieu cua

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

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