Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
cau theo » cau thi, cau tao
su sach » so sach, vu sach
lv nang » ly nang
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hai cau » hai chau, hai chu, hai hau
v nang » va nang, vu nang, van nang
va nam » ha nam, va nay

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 ((v nang) or (lv nang)) cau hoi. hieu ((va nam) OR (van nam)) thuc va hanh hai cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((v nang) OR (lv nang)) cau hoi. hieu ((va nam) OR (van nam)) thuc va hanh hai cau theo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((v nang) or (lv nang)) cau hoi. hieu ((va nam) OR (van nam)) thuc va hanh hai cau theo".
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) or (lv nang)) cau hoi. hieu ((va nam) OR (van nam)) thuc va hanh hai cau theo*.