Perhaps you should try some spelling variations:
nang phat » nang suat, van phat
nang chat » nang cham, nang cao, nang suat
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
sach ty » sach y, sach tu, sach thu
tuc va » truc va, tuc xa, duc va
vai va » mai va, dai va, hai 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: tu sach ty ((nang chat) OR (nang phat)) hoc. hieu ve cham ((tuc va) or (thuc va)) hanh vai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang chat) OR (nang phat)) hoc. hieu ve cham ((tuc va) OR (thuc va)) hanh vai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang chat) OR (nang phat)) hoc. hieu ve cham ((tuc va) or (thuc va)) hanh vai va thiet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang chat) OR (nang phat)) hoc. hieu ve cham ((tuc va) or (thuc va)) hanh vai va thiet*.