Perhaps you should try some spelling variations:
tran tren » tranh tren, tran tien, ran tren
dieu tran » dieu trang, dieu tra, kieu trang
hanh dieu » han dieu, hinh dieu, hoang dieu
day hanh » day nhanh, day thanh, dao hanh
nam thuc » nam thuoc, am thuc, nam tu
te sach » toc sach
tang ho » tang cho, tung ho, tang ha
ky tang » ky nang, ky dang, kho tang
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
ho hoi » hoc hoi, hoa hoi, hoi hoi

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) or (vu sach)) ky tang ho hoi. hieu ve ((nam thuc) or (nam thu)) day hanh dieu tran tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (vu sach)) ky tang ho hoi. hieu ve ((nam thuc) OR (nam thu)) day hanh dieu tran tren.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu sach)) ky tang ho hoi. hieu ve ((nam thuc) or (nam thu)) day hanh dieu tran tren*.