Perhaps you should try some spelling variations:
thien van » thi van
va nhanh » va thanh, va hanh, va nhan
chat hoc » chat hoa, chat thom, cho hoc
hai hai » khai hai, dai hai, tai hai
hai hau » hai chau, dai hau, lai chau
su sach » so sach, vu sach
van bao » van ban, van dao
bao xuc » bao luc, bao thuc
xuc va » duc va, tuc va, luc va
y nang » ky nang, ly nang, v nang

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 y nang ((cau hoi) or (chat hoc)). thien van bao xuc va nhanh ((hai hau) OR (hai hai)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((cau hoi) OR (chat hoc)). thien van bao xuc va nhanh ((hai hau) OR (hai hai)) treo*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((cau hoi) or (chat hoc)). thien van bao xuc va nhanh ((hai hau) OR (hai hai)) treo*".