Perhaps you should try some spelling variations:
hinh thai » sinh thai, tinh thai, dinh thi
hanh thai » nhanh thai, hanh tai, anh thai
cua tre » cua te, cuu tre, cua triet
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
ve cam » ve cham, ve cac, va cam
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 tang) OR (ky dang)) xa hoi. hieu ve cam duc van ((hanh thai) or (hinh thai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ((ky tang) OR (ky dang)) xa hoi. hieu ve cam duc van ((hanh thai) OR (hinh thai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ((ky tang) OR (ky dang)) xa hoi. hieu ve cam duc van ((hanh thai) or (hinh thai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sai ((ky tang) OR (ky dang)) xa hoi. hieu ve cam duc van ((hanh thai) or (hinh thai)) cua tre*.