Perhaps you should try some spelling variations:
cuc triet » cua triet, su triet, cac trieu
van hanh » van thanh, ban hanh, van anh
phat duc » pham duc, phan duc, phan duoc
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
duc van » duc va, duc tan, duc manh

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) or (thu hoach))) or (su sach)) ty nang x ho. hieu va phat duc van hanh tai cuc triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (thu hoach))) OR (su sach)) ty nang x ho. hieu va phat duc van hanh tai cuc triet.
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) or (thu hoach))) or (su sach)) ty nang x ho. hieu va phat duc van hanh tai cuc triet*.