Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
doc sach » hoc sach, toc sach, nuoc sach
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
hanh van » thanh van, khanh van, hanh va
su triet » su tien, ve triet
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
su viet » so viet

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

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