Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
toc sach » hoc sach, doc sach, thuoc sach
hanh van » thanh van, khanh van, hanh va
cao hoi » cau hoi, co hoi, cao hoc
hieu vi » hieu voi, hieu va, hieu ve
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
su tien » su kien, tu tieng, dau tien
su hien » su kien, thu hien, nhu hien

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dac sac) or (toc sach)) ky nang cao hoi. hieu vi pham thuc va hanh van ((su tien) or (su hien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dac sac) OR (toc sach)) ky nang cao hoi. hieu vi pham thuc va hanh van ((su tien) OR (su hien)).
• Adding a wildcard symbol may retrieve word variants: ((dac sac) or (toc sach)) ky nang cao hoi. hieu vi pham thuc va hanh van ((su tien) or (su hien))*.