Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
nang mai » nang ma, nang tai, lang mai
thuc va » thuc vat, thuc dan, thuc day
hang vi » hang va, hanh vi, khang voi
hang di » hang doi, hang dien, hang dich
su sach » so sach, vu sach
truc va » thuc vat, trung va
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam

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 mai hoi. hieu ve cam ((truc va) or (thuc va)) ((hang di) OR (hang vi)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang mai hoi. hieu ve cam ((truc va) OR (thuc va)) ((hang di) OR (hang vi)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang mai hoi. hieu ve cam ((truc va) or (thuc va)) ((hang di) OR (hang vi)) cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang mai hoi. hieu ve cam ((truc va) or (thuc va)) ((hang di) OR (hang vi)) cua viet*.