Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
vai cuu » vai cua
dan vai » dan va, dan tai, dan vat
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
tuc va » thuc va, truc va, duc va
ve cam » ve cham, ve cac, va cam

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