Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
su sach » so sach, vu sach
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
dau tuc » dau tu, dao tuc, cau truc
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((nang xa) or (lang van)) hoi. lieu va dau tuc xa ((hanh di) OR (hanh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (lang van)) hoi. lieu va dau tuc xa ((hanh di) OR (hanh de)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) or (lang van)) hoi. lieu va dau tuc xa ((hanh di) OR (hanh de)) cua tre*".