Perhaps you should try some spelling variations:
cham truc » nham thuc, pham thuc, nam truc
sach nay » sach hay, sach vay, sach nang
nay tang » nam tang, tay tang, anai tang
nhanh li » nhanh vi, thanh loi, nhanh thi
te sach » toc sach
hanh li » hanh vi, han li, thanh loi
ca tren » cau tren, cu tren, la tren
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa

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 nay tang xa hoi. hieu va ((cham truc) OR (cau truc)) va ((hanh li) or (nhanh li)) ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach nay tang xa hoi. hieu va ((cham truc) OR (cau truc)) va ((hanh li) OR (nhanh li)) ca tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach nay tang xa hoi. hieu va ((cham truc) OR (cau truc)) va ((hanh li) or (nhanh li)) ca tren".
• Adding a wildcard symbol may retrieve word variants: te sach nay tang xa hoi. hieu va ((cham truc) OR (cau truc)) va ((hanh li) or (nhanh li)) ca tren*.