Perhaps you should try some spelling variations:
cach thoi » cac thoi, cach thuc, cach noi
hoc khanh » hoc nhanh, hoc thanh, hoc hanh
khanh hoa » thanh hoa, hang hoa
sach hoi » sach doi, sach moi, hoach hoi
lang tai » lang thai, hang tai, tang tai
va lang » va nang, hoa lang
mo hoc » mon hoc, co hoc
hoc xa » hoc ma

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 hoi) or (cach thoi)) tap, nghien cuu mo hoc khanh hoa hoc xa hoi va lang tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach hoi) OR (cach thoi)) tap, nghien cuu mo hoc khanh hoa hoc xa hoi va lang tai.
• Adding a wildcard symbol may retrieve word variants: tu ((sach hoi) or (cach thoi)) tap, nghien cuu mo hoc khanh hoa hoc xa hoi va lang tai*.