Perhaps you should try some spelling variations:
ve triet » va trien
su triet » su viet, su tien
hieu van » hieu va, thien van, lieu va
hanh dai » hanh tai, hanh dao, vanh dai
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
van cam » van nam, van lam, van cau
ky hang » ky nang, ly hang, ky dang
tuc va » thuc va, truc va, tuc xa
va hoi » xa hoi, va hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky hang va hoi. hieu van cam ((duc va) or (tuc va)) hanh dai ((su triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky hang va hoi. hieu van cam ((duc va) OR (tuc va)) hanh dai ((su triet) OR (ve triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky hang va hoi. hieu van cam ((duc va) or (tuc va)) hanh dai ((su triet) OR (ve triet))*".