Perhaps you should try some spelling variations:
giai thanh » gia thanh, gian thanh, giay thanh
cua triet » cua viet, su triet, va triet
thanh vi » hanh vi, thanh va, thanh ve
hoc giai » hoc giao, hoc dai, so giai
cuu tre » cua tre, cau tren, cau treo
cac hoc » cach hoc, cac hop, bac hoc
so sach » so sanh, bo sach, co sach
ly hang » ly quang
ly nang » ky nang, ly vang, ly quang
hieu va » lieu va, hieu qua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((ly nang) OR (ly hang)) xa hoi. hieu va cac hoc giai thanh vi ((cuu tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ly nang) OR (ly hang)) xa hoi. hieu va cac hoc giai thanh vi ((cuu tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ly nang) OR (ly hang)) xa hoi. hieu va cac hoc giai thanh vi ((cuu tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: so sach ((ly nang) OR (ly hang)) xa hoi. hieu va cac hoc giai thanh vi ((cuu tre) or (cua triet))*.