Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
dinh cuu » dinh chi
te sach » toc sach
nang xa » lang xa, nang ma, mang xa
qua cac » cua cac
va danh » va dinh, va dan, va hanh
cac tu » cac thu, cach tu, cac du
di cuu » di cau, 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 thu ((nang xa) or (nang x)) hoi. hieu qua cac tu va danh ((di cuu) OR (dinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu ((nang xa) OR (nang x)) hoi. hieu qua cac tu va danh ((di cuu) OR (dinh cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu ((nang xa) or (nang x)) hoi. hieu qua cac tu va danh ((di cuu) OR (dinh cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach thu ((nang xa) or (nang x)) hoi. hieu qua cac tu va danh ((di cuu) OR (dinh cuu)) tre*.