Perhaps you should try some spelling variations:
cau trieu » cac trieu, cau triet, chua trieu
hanh hai » thanh hai, nhanh hai, hang hai
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
ca tren » cau tren, cu tren, la tren
nang o » nang co, nang ho, nang ro
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
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: su sach ty nang o hoi. hieu ve cac tuc va hanh hai ((cau trieu) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang o hoi. hieu ve cac tuc va hanh hai ((cau trieu) OR (ca tren)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang o hoi. hieu ve cac tuc va hanh hai ((cau trieu) or (ca tren))*.