Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
danh vai » danh sai, danh va, doanh van
hieu van » hieu va, thien van, lieu va
van chat » cao chat
sach thu » sach thue, sach thieu, sach tham
sach ty » sach y, sach tu, xach tay
vai dau » va dau, van dau, xvii dau
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sach thu)) nang x hoi. hieu van chat ((xuc va) or (tuc va)) danh vai dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) nang x hoi. hieu van chat ((xuc va) OR (tuc va)) danh vai dau tren.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thu)) nang x hoi. hieu van chat ((xuc va) or (tuc va)) danh vai dau tren*.