Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hang dien » quang dien, dang dieu, nhan dien
truc van » truc va, thuc van, truc ban
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, dua tren
va cau » van cau, va cac, va dau
x hoi » xa hoi, o hoi, x ho

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 ty nang x hoi. lieu va cau ((truc van) or (thuc va)) hang dien ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x hoi. lieu va cau ((truc van) OR (thuc va)) hang dien ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang x hoi. lieu va cau ((truc van) or (thuc va)) hang dien ((cua tre) OR (cua triet))*".