Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cam truc » cau truc, nam truc, lam truoc
danh vai » danh sai, danh va, doanh van
cuu tre » cua tre, cau treo
va danh » va dinh, va dan, va hanh
truc va » thuc va, thuc vat, trung va
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
ty hang » ly hang, ty xang, thi hang
ly nang » ky nang, ly hang, ly vang
va cam » va cham, va cac, va cao

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