Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, pham thuc
cua triet » cua viet, su triet, va triet
phat lap » phan lap, phap lap, phat lam
nham thu » nam thu, pham thu, nhan thuc
sach ty » sach y, sach tu, sach thu
lap cua » lai cua, tap cua, lam cua
tu sach » thu sach, su sach, te sach
nang ho » nang hoc, nang co, tang ho
hieu vu » hieu ve, hieu su, dieu vu
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
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 vu) or (hieu va)) ((nham thuc) OR (nham thu)) va phat lap cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ho hoi. ((hieu vu) OR (hieu va)) ((nham thuc) OR (nham thu)) va phat lap cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ho hoi. ((hieu vu) or (hieu va)) ((nham thuc) OR (nham thu)) va phat lap cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ho hoi. ((hieu vu) or (hieu va)) ((nham thuc) OR (nham thu)) va phat lap cua triet*.