Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
sach thi » sach thu, sach tai, sach thieu
hanh lam » thanh lap, hanh kem, hanh va
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, vien da
tuc van » thuc van, truc van, tuc va
su sach » so sach, vu sach
hanh ma » hanh mau, hanh may, hanh va
hanh xa » hanh va, hanh xu, canh xa
lam su » lai su, lam so, lam vu
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: su sach thi ((hanh xa) or (hanh ma)) hoi. hieu ((ve cam) or (vien cac)) tuc van hanh lam su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thi ((hanh xa) OR (hanh ma)) hoi. hieu ((ve cam) OR (vien cac)) tuc van hanh lam su triet.
• Adding a wildcard symbol may retrieve word variants: su sach thi ((hanh xa) or (hanh ma)) hoi. hieu ((ve cam) or (vien cac)) tuc van hanh lam su triet*.