Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
hieu van » hieu va, thien van, lieu va
duc manh » suc manh, duc anh, duc minh
hanh tri » thanh tri, hanh tai, hanh trinh
nang ra » nang ma, lang ra, nang ro
van cac » van hac, van cau, van bac
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu bac
tu san » thu san, tu ban, tu can
ra lai » ra glai, ru lai, va lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (tu san)) ky nang ra lai. hieu van cac duc manh hanh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu san)) ky nang ra lai. hieu van cac duc manh hanh tri cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu san)) ky nang ra lai. hieu van cac duc manh hanh tri cua tre*.