Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, dua tren
x hoi » xa hoi, o hoi, x ho

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 ly nang x hoi. hieu va pham duc van hanh tai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang x hoi. hieu va pham duc van hanh tai ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang x hoi. hieu va pham duc van hanh tai ((cua tre) or (cua triet))*.