Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
dinh hai » dinh thai, tinh hai, dinh ha
nang mai » nang ma, lang mai, nang cai
nang tai » hang tai, tang tai, sang tai
hieu van » hieu va, thien van, lieu va
hai cau » hai chau, hai chu, hai hau
va dinh » van dinh, va kinh, va tinh
truc va » thuc va, thuc vat, trung va
van cau » van dau, van hau, van chat
su sach » vu sach
so sach » so sanh, bo sach, co sach

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) or (so sach)) y ((nang mai) or (nang tai)) hoi. hieu van cau truc va dinh hai cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y ((nang mai) OR (nang tai)) hoi. hieu van cau truc va dinh hai cau theo.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) y ((nang mai) or (nang tai)) hoi. hieu van cau truc va dinh hai cau theo*.