Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
pham tai » pham thi, pham van
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
nang ma » tang ma, sang ma, nang cao
vu sach » vu bach, vu khach
va tinh » may tinh
tinh vi » trinh vi, tinh voi, tinh va
su sach » so sach
ma hoi » mai hoi, xa hoi, ma hoa
tai va » thai va, mai va, tri va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) OR (vu sach)) ky nang ma hoi. hieu van pham tai va tinh vi ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky nang ma hoi. hieu van pham tai va tinh vi ((cua triet) OR (va triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky nang ma hoi. hieu van pham tai va tinh vi ((cua triet) or (va triet))*".