Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
pham duy » pham duc
hanh hai » thanh hai, nhanh hai, hang hai
van hanh » van thanh, ban hanh, van anh
sach ty » sach tu, sach thu, xach tay
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
duy van » duy vat, dung van
hai su » hai vu, lai su, hai so
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sach y)) nang ((x hoi) OR (o hoi)). hieu ve pham duy van hanh hai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang ((x hoi) OR (o hoi)). hieu ve pham duy van hanh hai su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach y)) nang ((x hoi) OR (o hoi)). hieu ve pham duy van hanh hai su triet*".