Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cao cap » cao chat
dai cuu » dai cua, dai huu
dan dai » dat dai, can dai, dan dat
truc va » thuc va, thuc vat, trung va
cuu tre » cua tre, cau tren, cau treo
cao cau » co cau, tao cau, ca cau
ty nang » ty xang, ty hang, ly nang
va dan » ca dan, va dao, va dau

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