Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doanh ca » doanh cua, doanh cao, doanh va
va doanh » van doanh, vay doanh, va danh
thi hang » thi hanh, thi nang, thi hong
cua tre » cua te, cuu tre, dua tren
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
nam lo » nam bo, nam so, nam co
ve nam » he nam, va nam, le nam
lo va » lo van, lao va, ly va

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 ((ty nang) or (thi hang)) xa hoi. hieu ve nam lo va doanh ca ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (thi hang)) xa hoi. hieu ve nam lo va doanh ca ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (thi hang)) xa hoi. hieu ve nam lo va doanh ca ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (thi hang)) xa hoi. hieu ve nam lo va doanh ca ((cua tre) OR (cua triet))*.