Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
cau luc » cau truc, cau phuc
tu sach » thu sach, su sach, te sach
cac luc » coc luc, cac nuoc, cac cuoc
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
sach 2 » sach y
ma hoi » mai hoi, xa hoi, ma hoa
2 nang » v nang

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 2 nang ma hoi. hieu va ((cac luc) or (cau luc)) van hanh lai ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach 2 nang ma hoi. hieu va ((cac luc) OR (cau luc)) van hanh lai ((cua triet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach 2 nang ma hoi. hieu va ((cac luc) or (cau luc)) van hanh lai ((cua triet) or (va triet))*.