Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
manh hanh » xanh hanh, danh thanh, minh thanh
hanh tai » thanh tai, hang tai, han tai
duc manh » suc manh, duc anh, duc minh
cua tre » cua te, cuu tre, dua tren
va giao » van giao, va giai, va gia
hieu va » lieu va, hieu qua
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky dang » ky nang, ky danh
sai ky » sac ky
ha hoi » ha noi, xa hoi, va hoi
su sai » su tai, su hai, su dai

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 dang ((ha hoi) OR (hoa hoi)). hieu va giao duc manh hanh tai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky dang ((ha hoi) OR (hoa hoi)). hieu va giao duc manh hanh tai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky dang ((ha hoi) OR (hoa hoi)). hieu va giao duc manh hanh tai ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sai ky dang ((ha hoi) OR (hoa hoi)). hieu va giao duc manh hanh tai ((cua tre) or (cua triet))*.