Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
ly vang » ly hang, ly van, ly quang
ly nang » ky nang, ly hang, ly quang
cuu tre » cau tren, cau treo
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((ly nang) OR (ly vang)) xa hoi. hieu ve cac tu va hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ly nang) OR (ly vang)) xa hoi. hieu ve cac tu va hanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ly nang) OR (ly vang)) xa hoi. hieu ve cac tu va hanh vi ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ly nang) OR (ly vang)) xa hoi. hieu ve cac tu va hanh vi ((cua tre) or (cuu tre))*.