Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach ty, sach kem
tang xa » trang xa, tang ma, lang xa
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, cua triet
cua tuc » cua duc, cua tu, cua thuoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) or (sach y)) tang xa hoi. lieu va cac xuc van hanh vi ((cua tre) or (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) tang xa hoi. lieu va cac xuc van hanh vi ((cua tre) OR (cua tuc)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) tang xa hoi. lieu va cac xuc van hanh vi ((cua tre) or (cua tuc))*.