Perhaps you should try some spelling variations:
su sach » so sach, vu sach
hang di » hang doi, hang vi, hang dien
thuc va » thuc vat, thuc dan, thuc day
truc va » thuc vat, trung va
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
lai hoa » dai hoa, loai hoc
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
di hoa » dai hoa, doi hoa, do hoa

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) or (lai hoa)). hieu ve cham ((truc va) or (thuc va)) hang di hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((mai hoi) OR (lai hoa)). hieu ve cham ((truc va) OR (thuc va)) hang di hoa viet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((mai hoi) or (lai hoa)). hieu ve cham ((truc va) or (thuc va)) hang di hoa viet*.