Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
cua viet » ca viet, hoa viet, cua dieu
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
hang di » hang doi, hang vi, hang dien
truc va » thuc vat, trung va
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
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 mai khoi. hieu ve cham ((truc va) or (thuc va)) hang di ((cua viet) OR (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang mai khoi. hieu ve cham ((truc va) OR (thuc va)) hang di ((cua viet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang mai khoi. hieu ve cham ((truc va) or (thuc va)) hang di ((cua viet) OR (cua vat))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang mai khoi. hieu ve cham ((truc va) or (thuc va)) hang di ((cua viet) OR (cua vat))*.