Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nham thuc » nhan thuc, nam thuc, nham thu
pham thuc » phap thuc, pham chuc, pham thu
hanh lai » hanh lam, hanh tai, thanh lap
nang ma » tang ma, sang ma, nang cao
sach ky » sach y, sach ty, sach kem
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
hieu vi » hieu voi, hieu va, hieu ve
ma hoi » mai hoi, xa hoi, ma hoa
sac ky » cac ky, sai ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((sach ky) OR (sac ky)) nang ma hoi. hieu vi ((pham thuc) or (nham thuc)) va hanh lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((sach ky) OR (sac ky)) nang ma hoi. hieu vi ((pham thuc) OR (nham thuc)) va hanh lai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((sach ky) OR (sac ky)) nang ma hoi. hieu vi ((pham thuc) or (nham thuc)) va hanh lai cua triet".
• Adding a wildcard symbol may retrieve word variants: doc ((sach ky) OR (sac ky)) nang ma hoi. hieu vi ((pham thuc) or (nham thuc)) va hanh lai cua triet*.