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
lap cua » lai cua, tap cua, lam cua
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu vu » hieu va, hieu ve, hieu su
nang ho » nang hoc, nang co, tang ho
ty nang » ky nang, ty xang, ty hang
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 qua)) ((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 qua)) ((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 qua)) ((nham thuc) or (nham thu)) va phat lap cua triet*.