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

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 va 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 va 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 va viet*.