Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, thanh san
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » thien van, lieu va, hieu ve
nam thuc » nam thuoc, am thuc, nam thu
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
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 xa hoi. ((hieu van) or (hieu va)) nam thuc va ((thanh tai) OR (doanh tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky lang xa hoi. ((hieu van) OR (hieu va)) nam thuc va ((thanh tai) OR (doanh tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky lang xa hoi. ((hieu van) or (hieu va)) nam thuc va ((thanh tai) OR (doanh tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky lang xa hoi. ((hieu van) or (hieu va)) nam thuc va ((thanh tai) OR (doanh tai)) cua te*.