Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
thu sach » tu sach, thuat sach, thuoc sach
nang van » dang van, tang van, lang van
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
tu cach » tu cac
van hoc » van hoa
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
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: ((tu cach) or (thu sach)) ky nang van hoc. ((hieu van) OR (thien van)) cam xuc va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky nang van hoc. ((hieu van) OR (thien van)) cam xuc va hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thu sach)) ky nang van hoc. ((hieu van) OR (thien van)) cam xuc va hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky nang van hoc. ((hieu van) OR (thien van)) cam xuc va hanh va cua tre*.