Perhaps you should try some spelling variations:
thien van » thi van
cau tren » cu tren, dau tren, ca tren
sach doi » sach hoi, sach moi, sach dao
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
cau tuc » cau truc, cau tu, cau luc
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
van cau » van dau, van hau, van chat
tuc va » thuc va, truc va, tuc xa

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 doi ((nang xa) or (lang xa)) hoi. thien van cau tuc va hanh vi ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach doi ((nang xa) OR (lang xa)) hoi. thien van cau tuc va hanh vi ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: su sach doi ((nang xa) or (lang xa)) hoi. thien van cau tuc va hanh vi ((cua tre) or (cau tren))*.