Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cac thoi » cac toi, cac hop, cac tro
thoi gia » thoi gian, hoi gia, thoi gio
thanh vi » hanh vi, thanh va, thanh ve
bo sach » co sach, hoc sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach y ((nang xa) or (nang ma)) hoi. hieu va cac thoi gia thanh vi ((cuu tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach y ((nang xa) OR (nang ma)) hoi. hieu va cac thoi gia thanh vi ((cuu tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: bo sach y ((nang xa) or (nang ma)) hoi. hieu va cac thoi gia thanh vi ((cuu tre) or (cua triet))*.