Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thu sach » tu sach, thuat sach, thuoc sach
tu cach » tu cac
dao tuc » dao duc
dao xuc » dao duc, dao xu, dao xuan
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
va lang » va nang, hoa lang
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: ((tu cach) or (thu sach)) va lang xa hoi. hieu va ((dao xuc) or (dao tuc)) van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) va lang xa hoi. hieu va ((dao xuc) OR (dao tuc)) van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) va lang xa hoi. hieu va ((dao xuc) or (dao tuc)) van hanh vi cua tre*.