Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cam tuc » cam xuc, cam tu, nam thuc
va cam » va cham, va cac, va cao
sach v » sach va, sach 2, sach vay
di cau » da cau, diem cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach v) or (sach y)) nang xa hoi. hieu va cam tuc ((va danh) OR (va hanh)) di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach v) OR (sach y)) nang xa hoi. hieu va cam tuc ((va danh) OR (va hanh)) di cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach v) or (sach y)) nang xa hoi. hieu va cam tuc ((va danh) OR (va hanh)) di cau tren".
• Adding a wildcard symbol may retrieve word variants: toc ((sach v) or (sach y)) nang xa hoi. hieu va cam tuc ((va danh) OR (va hanh)) di cau tren*.