Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
ve chao » ve chat, ve cham, ve cho
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
x hoi » xa hoi, o hoi, x ho
xu va » xu van, tu va, su va

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 (vu sach)) ky nang x hoi. hieu ve chao xu va hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ky nang x hoi. hieu ve chao xu va hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky nang x hoi. hieu ve chao xu va hanh vi ((cua tre) or (cuu tre))*.