Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, pham thu
nham thuc » nhan thuc, nam thuc, nham thu
day hanh » day nhanh, day thanh, dao hanh
tu sach » thu sach, te sach, tu cach
hanh di » hanh vi, hanh de, hang di
hieu ve » hieu va, hieu van
nang co » nang cao, nang doc, nang noi
su sach » so sach, vu sach
di cua » dai cua, doi cua, de cua
cua tu » cua tuc, cua su, cua cu

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 co hoc. hieu ve ((pham thuc) or (nham thuc)) day hanh di cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang co hoc. hieu ve ((pham thuc) OR (nham thuc)) day hanh di cua tu.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang co hoc. hieu ve ((pham thuc) or (nham thuc)) day hanh di cua tu*.