Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thu sach » tu sach, thuat sach, thuoc sach
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
sach ky » sac ky, sach y, sach ty
hieu vi » hieu voi, hieu va, hieu ve
hanh di » hanh vi, hanh de, hang di
co hoi » co loi
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: thu sach ky nang ((co hoi) or (co hoc)). hieu vi pham thuc dan hanh di cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((co hoi) OR (co hoc)). hieu vi pham thuc dan hanh di cua tu.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((co hoi) or (co hoc)). hieu vi pham thuc dan hanh di cua tu*.