Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hanh hai » thanh hai, nhanh hai, hang hai
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
hieu vu » hieu va, hieu ve, hieu su
vu pham » su pham, vi pham, vu kham
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hai cua » thai cua, dai cua, hoi cua
cua te » cua tu
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) or (su sach)) ky nang x hoi. hieu vu pham thuc va hanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x hoi. hieu vu pham thuc va hanh hai cua te.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang x hoi. hieu vu pham thuc va hanh hai cua te*.