Perhaps you should try some spelling variations:
thien van » thi van
thanh ha » thanh hoa, thanh hai, nhanh ha
thuc dan » thuc hanh, hoc dan, thuc vat
thuc va » thuc vat, thuc day
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach 2, sach vay
ha cua » hoa cua, hai cua, nha 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 v) or (sach y)) nang xa hoi. thien van cam ((thuc va) OR (thuc dan)) thanh ha cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach v) OR (sach y)) nang xa hoi. thien van cam ((thuc va) OR (thuc dan)) thanh ha cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach v) or (sach y)) nang xa hoi. thien van cam ((thuc va) OR (thuc dan)) thanh ha cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach v) or (sach y)) nang xa hoi. thien van cam ((thuc va) OR (thuc dan)) thanh ha cua tre*.