Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
ban hanh » ban hang
ly nang » ky nang, ly hang, ly vang
nam qua » nam quan, nam mua, nam xua
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, v nang, may nang
di cua » dai cua, doi cua, de 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 ((y nang) or (ly nang)) xa hoi. thien van ((nam qua) OR (nam cua)) ban hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((y nang) OR (ly nang)) xa hoi. thien van ((nam qua) OR (nam cua)) ban hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((y nang) or (ly nang)) xa hoi. thien van ((nam qua) OR (nam cua)) ban hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((y nang) or (ly nang)) xa hoi. thien van ((nam qua) OR (nam cua)) ban hanh di cua tre*.