Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tu, cac tac
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
tuc va » thuc va, truc va, tuc xa
va cua » va chua, via cua, ca 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 ((ky lang) or (ky dang)) xa hoi. ((hieu va) OR (hieu qua)) cac tuc va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky lang) OR (ky dang)) xa hoi. ((hieu va) OR (hieu qua)) cac tuc va hanh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky lang) or (ky dang)) xa hoi. ((hieu va) OR (hieu qua)) cac tuc va hanh va cua tre*".