Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
nang mai » nang ma, nang tai, lang mai
thuc van » thuc vat, thuc hanh, hoc van
hang vi » hang va, hanh vi, hang di
thuc va » thuc vat, thuc day
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ty nang » ky nang, ty xang, ty hang
ve cam » ve cham, ve cac, va cam
vi va » vi van, vai va, vu va
thiet* » thieu*

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 ty nang mai hoi. hieu ve cam ((thuc dan) or (((thuc van) or (thuc va)))) hang vi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang mai hoi. hieu ve cam ((thuc dan) OR (((thuc van) OR (thuc va)))) hang vi va thiet*.