Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
te sach » toc sach
doi cua » dai cua, hoi cua
nang ho » nang hoc, nang co, tang ho
qua cam » qua cham, qua cac, qua ca
truc va » thuc va, thuc vat, trung va
cua tu » cua tuc, cua su, cua cu
tuc va » thuc va, tuc xa, duc va
sach v » sach va, sach y, sach 2
loc va » hoc va, luc va
ho hoi » hoc hoi, hoa hoi, hoi 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 ho hoi. hieu qua cam ((loc va) or (((tuc va) or (truc va)))) thanh doi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang ho hoi. hieu qua cam ((loc va) OR (((tuc va) OR (truc va)))) thanh doi cua tu.
• Adding a wildcard symbol may retrieve word variants: te sach v nang ho hoi. hieu qua cam ((loc va) or (((tuc va) or (truc va)))) thanh doi cua tu*.