Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
dua tren » dung tren
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty tang » tay tang, ty xang, ty hang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
duc van » duc va, duc manh, duc phan
cuu tre » cua tre, cau tren, cau treo
ve cam » ve cham, ve cac, va cam

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 tang xa hoi. hieu ve cam ((duc van) OR (duc tan)) thanh vi ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty tang xa hoi. hieu ve cam ((duc van) OR (duc tan)) thanh vi ((dua tren) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty tang xa hoi. hieu ve cam ((duc van) OR (duc tan)) thanh vi ((dua tren) or (cuu tre))*".