Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
toc sach » hoc sach, doc sach, thuoc sach
thai cua » than cua, tai cuc, tri cua
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
dung ha » dung va, dung he, dung khoa
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
dang ha » dong ha, lang ha, tang ha
nam tu » nam thu
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 ((dang ha) OR (dung ha)) hoi. hieu van ((nam tu) OR (nam thuc)) va hanh thai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((dang ha) OR (dung ha)) hoi. hieu van ((nam tu) or (nam thuc)) va hanh thai cua te~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((dang ha) OR (dung ha)) hoi. hieu van ((nam tu) or (nam thuc)) va hanh thai cua te*.