Perhaps you should try some spelling variations:
tang hanh » tang thanh, dang hanh, nang hanh
thu sach » tu sach, thuat sach, thuoc sach
duc tang » duc thang, duc tan, tuc tang
ly nang » ly hang, ly vang, ly quang
mai hoi » mai khoi, dai hoi, lai hoi
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
ma hoi » xa hoi, ma hoa, me hoi
va cam » va cham, va cac, va cao
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: thu sach ((ly nang) OR (ky nang)) ((ma hoi) or (mai hoi)). lieu va cam duc tang hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ly nang) OR (ky nang)) ((ma hoi) OR (mai hoi)). lieu va cam duc tang hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ly nang) OR (ky nang)) ((ma hoi) or (mai hoi)). lieu va cam duc tang hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ly nang) OR (ky nang)) ((ma hoi) or (mai hoi)). lieu va cam duc tang hanh vi cua tre*.