Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, lieu va, hieu ve
hanh tai » thanh tai, hang tai, han tai
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
nam tuc » nam thuc, nam truc, nam thuoc
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, tri cua
nam tu » nam thu, nam thuc
cua te » cua tu

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: toc sach ky lang xa hoi. ((hieu van) OR (thien van)) ((nam tuc) OR (nam tu)) va hanh tai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky lang xa hoi. ((hieu van) OR (thien van)) ((nam tuc) or (nam tu)) va hanh tai cua te~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. ((hieu van) OR (thien van)) ((nam tuc) or (nam tu)) va hanh tai cua te*.