Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, khau sach
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
tu sach » su sach, te sach, tu cach
nam xuc » cam xuc, nam xua, nam thuc
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
nang o » nang co, nang ho, nang ro
xuc va » duc va, tuc va, luc va
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (((thu sach) OR (thu hoach)))) ky nang o hoi. hieu van nam xuc va hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((thu sach) OR (thu hoach)))) ky nang o hoi. hieu van nam xuc va hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((thu sach) OR (thu hoach)))) ky nang o hoi. hieu van nam xuc va hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((thu sach) OR (thu hoach)))) ky nang o hoi. hieu van nam xuc va hanh vai cua te*.