Perhaps you should try some spelling variations:
sach han » sach tham, sach danh, sach nang
van hanh » van thanh, ban hanh, van anh
bach van » bach dan, cach van, bach dang
truc van » truc va, thuc van, truc ban
hanh te » hanh tu, hanh ve, hanh de
hieu ke » hieu kem, chieu ke, hieu ky
cua tre » cua te, cuu tre, cua triet
nang ho » nang hoc, nang co, tang ho
sach ha » sach nha, sach xa, bach ha
ke cau » ket cau
te cua » tue cua, le cua, de cua
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: su ((((sach han) or (bach van))) or (sach ha)) nang ho hoi. hieu ke cau truc van hanh te cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((((sach han) OR (bach van))) OR (sach ha)) nang ho hoi. hieu ke cau truc van hanh te cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((((sach han) or (bach van))) or (sach ha)) nang ho hoi. hieu ke cau truc van hanh te cua tre*.