Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
phan dau » phan tu, hang dau
cau thuc » cau truc, cuu thuc, can thuc
tu sach » thu sach, su sach, tu cach
nang ho » nang hoc, nang co, tang ho
ty nang » ky nang, ty xang, ty hang
te sach » toc sach
hieu va » lieu va, hieu qua
ho hoi » hoc hoi, hoa hoi, hoi hoi
va cau » van cau, va cac, 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: ((tu sach) or (te sach)) ty nang ho hoi. hieu va cau thuc vat ((phan lap) OR (phan dau)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ty nang ho hoi. hieu va cau thuc vat ((phan lap) OR (phan dau)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ty nang ho hoi. hieu va cau thuc vat ((phan lap) OR (phan dau)) cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ty nang ho hoi. hieu va cau thuc vat ((phan lap) OR (phan dau)) cua triet*.