Perhaps you should try some spelling variations:
doanh qua » doanh quan, doanh cua, danh qua
truc van » truc va, thuc van, truc ban
te sach » toc sach
qua cua » quan cua, quang cua, qua quan
tuc van » thuc van, tuc va, duc van
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
me hoi » le hoi
v nang » va nang, vu nang, van nang

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 v nang ((me hoi) or (ma hoa)). hieu va cac ((tuc van) or (truc van)) doanh qua cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang ((me hoi) OR (ma hoa)). hieu va cac ((tuc van) OR (truc van)) doanh qua cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach v nang ((me hoi) or (ma hoa)). hieu va cac ((tuc van) or (truc van)) doanh qua cua tre*.