Perhaps you should try some spelling variations:
thien van » thi van
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, lieu va, hieu ve
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
ca tren » cau tren, cu tren, la tren
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
va ca » va cac, va cao, va cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach y nang x ho. ((hieu van) or (thien van)) cam xuc va hanh va ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y nang x ho. ((hieu van) OR (thien van)) cam xuc va hanh va ca tren.
• Adding a wildcard symbol may retrieve word variants: hoc sach y nang x ho. ((hieu van) or (thien van)) cam xuc va hanh va ca tren*.