Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
cua triet » cua viet, su triet, va triet
viec cac » vien cac, viec cua, viec lam
su sach » so sach, vu sach
cao hoa » cao hoat, cao khoa, cau hoa
va hang » van hang, va nang, va lang
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, ly nang, v nang
cac tu » cac thu, cach tu, cac du

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang cao hoa. hieu viec cac tu va hang va ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang cao hoa. hieu viec cac tu va hang va ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang cao hoa. hieu viec cac tu va hang va ((cua tre) OR (cua triet))*.