Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
doc sach » hoc sach, toc sach, nuoc sach
hanh dao » lanh dao, thanh dat, thanh dam
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
te sach » toc sach
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (doc sach)) y nang ma hoi. hieu ve cam duc va hanh dao ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (doc sach)) y nang ma hoi. hieu ve cam duc va hanh dao ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (doc sach)) y nang ma hoi. hieu ve cam duc va hanh dao ((cua tre) or (su triet))*.