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
lang ha » long ha
sach ky » sac ky, sach y, sach ty
lang xa » dang xay, lang van
cam duc » cam xuc, cao duc, pham duc
duc may » duc mau, duc man, duc manh
tinh di » tinh doi, trinh di, tinh da
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de 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 ky ((lang xa) or (lang ha)) hoi. ((nhieu viec) OR (hieu viec)) cam duc may tinh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((lang xa) OR (lang ha)) hoi. ((nhieu viec) OR (hieu viec)) cam duc may tinh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((lang xa) or (lang ha)) hoi. ((nhieu viec) OR (hieu viec)) cam duc may tinh di cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((lang xa) or (lang ha)) hoi. ((nhieu viec) OR (hieu viec)) cam duc may tinh di cua tre*.