Perhaps you should try some spelling variations:
thien van » thi van
thuc dan » thuc hanh, hoc dan
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
van cam » van nam, van lam, van cau
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
va cua » va chua, via cua, ca cua
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 ty lang xa hoi. thien van cam ((tuc va) or (((thuc dan) OR (thuc vat)))) hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty lang xa hoi. thien van cam ((tuc va) OR (((thuc dan) OR (thuc vat)))) hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty lang xa hoi. thien van cam ((tuc va) or (((thuc dan) OR (thuc vat)))) hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty lang xa hoi. thien van cam ((tuc va) or (((thuc dan) OR (thuc vat)))) hanh va cua tre*.