Perhaps you should try some spelling variations:
cua triet » su triet, va triet
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
lam luc » lao luc, lam duoc
luc van » luoc van, luu van, duc van
va lam » van lam, va lap

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 y ((nang ma) or (tang ma)) hoi. lieu va lam luc van hanh kem ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang ma) OR (tang ma)) hoi. lieu va lam luc van hanh kem ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang ma) or (tang ma)) hoi. lieu va lam luc van hanh kem ((cua triet) or (cua viet))*.