Perhaps you should try some spelling variations:
thieu khien » tieu khien, dieu khien, thien nhien
khien cau » hien cau, thien cau, khien canh
truc van » truc va, thuc van, truc ban
su triet » su viet, su tien, ve triet
van anh » van thanh, tuan anh, van minh
sach v » sach va, sach 2, sach vay
anh di » danh di, xanh di, anh d
x hoi » xa hoi, o hoi, x ho
di su » doi su, ki su, da su

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 v) or (sach y)) nang x hoi. thieu khien cau truc van anh di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach v) OR (sach y)) nang x hoi. thieu khien cau truc van anh di su triet.
• Adding a wildcard symbol may retrieve word variants: su ((sach v) or (sach y)) nang x hoi. thieu khien cau truc van anh di su triet*.