Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
va danh » va dinh, va dan, va hanh
sach ky » sac ky, sach y, sach kem
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
su viet » so viet
cam tu » cam thu, nam tu, dam tu
ki su » ky su

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ky) OR (sach ty)) nang xa hoi. hieu van cam tu ((va thanh) OR (va danh)) ki su viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ky) OR (sach ty)) nang xa hoi. hieu van cam tu ((va thanh) or (va danh)) ki su viet~".
• Adding a wildcard symbol may retrieve word variants: vu ((sach ky) OR (sach ty)) nang xa hoi. hieu van cam tu ((va thanh) or (va danh)) ki su viet*.