Perhaps you should try some spelling variations:
thien van » thi van
hanh di » hanh vi, hanh de, hang di
van cam » van nam, van lam, van cau
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
lang ha » long ha
lang xa » dang xay, lang van
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de 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 xa) OR (lang ha)) hoi. thien van cam ((luc va) or (hoc va)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((lang xa) OR (lang ha)) hoi. thien van cam ((luc va) OR (hoc va)) hanh di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((lang xa) OR (lang ha)) hoi. thien van cam ((luc va) or (hoc va)) hanh di cua tre*".