Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
va coc » va cuoc, va cac, va hoc
ha hoi » hoa hoi, ha noi, xa hoi

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 lang ha hoi. hieu va coc luc ((va tinh) or (may tinh)) vi ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang ha hoi. hieu va coc luc ((va tinh) OR (may tinh)) vi ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: su sach ky lang ha hoi. hieu va coc luc ((va tinh) or (may tinh)) vi ((cua tre) or (su triet))*.