Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dam thuc » am thuc, dan thuc, nam thuc
vat phan » van phan, sat phan, viet phan
dau thuc » dan thuc, dai thuc, day thuc
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
nang ho » nang hoc, nang co, tang ho
va phan » van phan, va phat, va phap
ty nang » ky nang, ty xang, ty hang
lap cua » lai cua, tap cua, lam cua
tu sach » thu sach, su sach, te sach
ho hoi » hoc hoi, hoa hoi, hoi hoi

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 ho hoi. hieu va ((dau thuc) OR (dam thuc)) ((vat phan) or (va phan)) lap cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ho hoi. hieu va ((dau thuc) OR (dam thuc)) ((vat phan) OR (va phan)) lap cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ho hoi. hieu va ((dau thuc) OR (dam thuc)) ((vat phan) or (va phan)) lap cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ho hoi. hieu va ((dau thuc) OR (dam thuc)) ((vat phan) or (va phan)) lap cua triet*.