Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
thanh de » hanh de, thanh ve, thanh do
va thanh » gia thanh, ban thanh, va tinh
va pham » van pham, va phat, va phap
sach ty » sach y, sach tu, sach thu
vu sach » vu bach, su sach, vu khach
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
ma hoi » xa hoi, ma hoa, me hoi

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

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