Perhaps you should try some spelling variations:
dang thi » hoang thi, dang khoi
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach kem, sach hay
sach ty » sach tu, sach thu, xach tay
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cac tac » cac toc, cac bac, cac dac
va dang » van dang, va nang, va lang
thi cau » thi chau, thi cu, thi cam
tac va » tac da, tac xa, tuc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((((sach ky) OR (sach y))) or (sach ty)) lang xa hoi. hieu va cac tac va dang thi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((((sach ky) OR (sach y))) OR (sach ty)) lang xa hoi. hieu va cac tac va dang thi cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((((sach ky) OR (sach y))) or (sach ty)) lang xa hoi. hieu va cac tac va dang thi cau tren*".