Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
cua viet » ca viet, hoa viet, cua vat
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
nang ho » nang hoc, nang co, tang ho
va ban » van ban, va bai, va bao
do van » dao van, vo van, so van
ho hoi » hoc hoi, hoa hoi, hoi hoi
bo van » vo van, so van, ho van

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ho hoi. hieu va ban ((bo van) or (do van)) hanh vi ((cua viet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ho hoi. hieu va ban ((bo van) OR (do van)) hanh vi ((cua viet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ho hoi. hieu va ban ((bo van) or (do van)) hanh vi ((cua viet) or (su triet))*.