Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
hanh thai » hinh thai, hanh tai, anh thai
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
van cam » van nam, van lam, van cau
xay hoi » xa hoi, tay hoi, cay phoi
sac ky » cac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sai ky) OR (sac ky)) dang xay hoi. hieu van cam duc va ((hanh thai) or (nhanh thai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sai ky) OR (sac ky)) dang xay hoi. hieu van cam duc va ((hanh thai) OR (nhanh thai)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sai ky) OR (sac ky)) dang xay hoi. hieu van cam duc va ((hanh thai) or (nhanh thai)) cua tre*".