Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
va thanh » gia thanh, ban thanh, va tinh
ky lang » ky nang, tay lang
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
thuc va » thuc vat, thuc dan, thuc day
tai cua » thai cua, tai cuc, tri cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((((ky lang) OR (ky dang))) or (ky tang)) xa hoi. hieu van nam thuc va thanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((((ky lang) OR (ky dang))) OR (ky tang)) xa hoi. hieu van nam thuc va thanh tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((((ky lang) OR (ky dang))) or (ky tang)) xa hoi. hieu van nam thuc va thanh tai cua te".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((((ky lang) OR (ky dang))) or (ky tang)) xa hoi. hieu van nam thuc va thanh tai cua te*.