Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cham xuc » cam xuc, chat xuc, cham soc
su sach » so sach, vu sach
xuc van » duc van, luc van, vuc van
hieu su » hieu sau, tieu su, hieu so
sach ty » sach y, sach tu, sach thu
hieu vu » hieu va, hieu ve, dieu vu
nang xa » nang x, lang xa, nang ma
lang ha » long ha
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((nang xa) or (lang ha)) hoi. ((hieu vu) OR (hieu su)) cham xuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (lang ha)) hoi. ((hieu vu) OR (hieu su)) cham xuc van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) or (lang ha)) hoi. ((hieu vu) OR (hieu su)) cham xuc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (lang ha)) hoi. ((hieu vu) OR (hieu su)) cham xuc van hanh vi cua tre*.