Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
danh tri » dinh tri, thanh tri, danh thin
hoc sach » hoc sinh, hoc cac, hoc anh
va danh » va dinh, va dan, va hanh
cau tuc » cau truc, cau tu, cau luc
hieu va » lieu va, hieu qua
toc sac » toc sach, toc san, doc sach
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
tuc va » thuc va, truc va, tuc xa
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: ((toc sac) OR (hoc sach)) ky tang xa hoi. ((hieu van) or (hieu va)) cau tuc va danh tri cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sac) OR (hoc sach)) ky tang xa hoi. ((hieu van) OR (hieu va)) cau tuc va danh tri cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sac) OR (hoc sach)) ky tang xa hoi. ((hieu van) or (hieu va)) cau tuc va danh tri cua te".
• Adding a wildcard symbol may retrieve word variants: ((toc sac) OR (hoc sach)) ky tang xa hoi. ((hieu van) or (hieu va)) cau tuc va danh tri cua te*.