Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cau tuc » cau truc, cau tu, cau luc
sach tu » sach thu, cach tu, sach ty
van cau » van dau, van hau, van chat
nang xa » lang xa, nang ma, mang xa
su viet » so viet
ki su » ky su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach tu ((nang xa) or (nang x)) hoi. hieu van cau tuc ((va hanh) or (va danh)) ki su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tu ((nang xa) OR (nang x)) hoi. hieu van cau tuc ((va hanh) OR (va danh)) ki su viet.
• Adding a wildcard symbol may retrieve word variants: thu sach tu ((nang xa) or (nang x)) hoi. hieu van cau tuc ((va hanh) or (va danh)) ki su viet*.