Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
hieu van » hieu va, thien van, lieu va
thi hang » thi hanh, thi hong, thi thanh
hanh vai » hanh vi, hanh va, hanh tai
thi nang » thi cong, ki nang, thi hanh
vai dau » va dau, van dau, xvii dau
va hanh » van hanh, va thanh, va danh
cam duc » cam xuc, cao duc, pham duc
tu sach » thu sach, su sach, te sach
hieu ve » hieu va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thi hang) OR (thi nang)) xa hoi. ((hieu ve) OR (hieu van)) cam duc va hanh vai dau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((thi hang) OR (thi nang)) xa hoi. ((hieu ve) or (hieu van)) cam duc va hanh vai dau tren~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((thi hang) OR (thi nang)) xa hoi. ((hieu ve) or (hieu van)) cam duc va hanh vai dau tren*.