Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
thu sach » thuat sach, thuoc sach, thu hoach
viec cam » viec lam, viec cua, viec va
tu sach » su sach, te sach, tu cach
tinh di » tinh doi, trinh di, tinh da
va tinh » may tinh
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
cong ha » cong hoa, dong ha, cong tac
lang xa » lang ha, dang xay, lang van
tuc va » thuc va, truc va, tuc xa
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: ((tu sach) or (thu sach)) ky ((lang xa) or (cong ha)) hoi. hieu viec cam tuc va tinh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky ((lang xa) OR (cong ha)) hoi. hieu viec cam tuc va tinh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky ((lang xa) or (cong ha)) hoi. hieu viec cam tuc va tinh di cua tre*.