Perhaps you should try some spelling variations:
thanh nghi » thanh nguoi, thanh ngu, hanh nghe
sach thue » sach thu, sach thieu, sach tham
va trien » va truyen, va thiet, va tuyen
va thanh » gia thanh, ban thanh, va tinh
cam thuc » am thuc, nam thuc, cam thu
nghi va » nghi ve, nghiep va, nghiem va
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
sang ma » tang ma, nang ma, sang tao
nang xa » nang x, lang xa, nang ma
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: tu ((sach ty) or (sach thue)) ((nang xa) or (sang ma)) hoi. hieu ve cam thuc va thanh nghi va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thue)) ((nang xa) OR (sang ma)) hoi. hieu ve cam thuc va thanh nghi va trien.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thue)) ((nang xa) or (sang ma)) hoi. hieu ve cam thuc va thanh nghi va trien*.