Perhaps you should try some spelling variations:
thien van » thi van
thuc ha » thu ha, thuc va, thuc hanh
thuc ma » thuoc ma, thuc va, thuc vat
sach ty » sach y, sach tu, sach thu
te sach » toc sach
lang co » lang o, nang co, tang co
ty lang » tay lang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo
co hoi » co hoc, co loi
vi cuu » vi luu, vinh cuu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty lang co hoi. ((lieu va) or (thien van)) nhan ((thuc ma) OR (thuc ha)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty lang co hoi. ((lieu va) OR (thien van)) nhan ((thuc ma) OR (thuc ha)) hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty lang co hoi. ((lieu va) or (thien van)) nhan ((thuc ma) OR (thuc ha)) hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty lang co hoi. ((lieu va) or (thien van)) nhan ((thuc ma) OR (thuc ha)) hanh vi cuu tre*.