Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hanh van » thanh van, khanh van, hanh va
tu tieng » luc tieng, tu trong
tu tuong » tu dong
doc sac » doc sach, dac sac, hoc sach
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, su hien, dau tien
sac ky » cac ky, sai ky

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

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