Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
lang ha » long ha
dau tuc » dau tu, dao tuc, cau truc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
va dau » va dao
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, 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: su sach ty ((lang van) or (lang ha)) hoi. lieu va dau tuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((lang van) OR (lang ha)) hoi. lieu va dau tuc va hanh vi cua tre*.