Perhaps you should try some spelling variations:
chan theo » cau theo, hanh theo, pham theo
dang mai » dang hai, dang mau, dang bai
cap doan » tap doan, chan doan, cac doanh
hieu van » thien van, hieu ve
theo cap » theo phap, pho cap, theo chu
te sach » toc sach
doan vi » doan va, don vi, doan thi
cua tre » cua te, cuu tre, cua triet
hieu va » hieu qua
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
ky dang » ky nang, ky danh
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky dang mai hoi. ((((hieu van) OR (lieu va))) or (hieu va)) chan theo cap doan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang mai hoi. ((((hieu van) OR (lieu va))) OR (hieu va)) chan theo cap doan vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang mai hoi. ((((hieu van) OR (lieu va))) or (hieu va)) chan theo cap doan vi cua tre*".