Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
nam thuc » nam thuoc, am thuc, nam thu
hang hai » hoang hai, hang tai, thanh hai
hanh hai » thanh hai, nhanh hai, hanh tai
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
lv nang » ly nang
v nang » va nang, vu nang, van nang
va nam » van 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 thuc va ((hanh hai) OR (hang 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 thuc va ((hanh hai) OR (hang 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 thuc va ((hanh hai) OR (hang hai)) cau theo".
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) or (lv nang)) cau hoi. hieu va nam thuc va ((hanh hai) OR (hang hai)) cau theo*.