Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
ve nam » va nam, le nam, te nam
ha hoi » hoa hoi, ha noi, xa hoi
va dan » ca dan, va dao, va dau
he nam » ha nam, nghe nam
vi su » va su, ve su, ki su

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 lang ha hoi. hieu ((ve nam) OR (he nam)) thuc ((va hanh) or (va dan)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang ha hoi. hieu ((ve nam) OR (he nam)) thuc ((va hanh) OR (va dan)) vi su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang ha hoi. hieu ((ve nam) OR (he nam)) thuc ((va hanh) or (va dan)) vi su triet*".