Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
cua triet » su triet, va triet
va thanh » gia thanh, ban thanh, va tinh
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty hang, ly nang
hieu va » lieu va, hieu qua
cac cay » ca cay, cac cam, cac cap
cay va » chay va, day va, may 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 ((ty nang) or (ty xang)) xa hoi. hieu va cac cay va thanh lap ((cua triet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty xang)) xa hoi. hieu va cac cay va thanh lap ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ty xang)) xa hoi. hieu va cac cay va thanh lap ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty xang)) xa hoi. hieu va cac cay va thanh lap ((cua triet) OR (cua viet))*.