Perhaps you should try some spelling variations:
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va
hoa hoi » khoa hoi, hoa hoc, hoa doi
sai ky » sac ky
ha hoi » ha noi, xa hoi, va hoi
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua
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 nang ((ha hoi) or (hoa hoi)). ((hieu va) OR (hieu qua)) cam tuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky nang ((ha hoi) OR (hoa hoi)). ((hieu va) OR (hieu qua)) cam tuc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky nang ((ha hoi) or (hoa hoi)). ((hieu va) OR (hieu qua)) cam tuc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sai ky nang ((ha hoi) or (hoa hoi)). ((hieu va) OR (hieu qua)) cam tuc va hanh vi cua tre*.