Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
tang mai » tang ma, tang tai, lang mai
dinh vai » dinh van, dinh vi, dinh va
dan dinh » dang dinh, doan dinh, van dinh
thuc dan » thuc hanh, hoc dan, thuc vat
mai khoi » mai khoa, tai khoa, cac khoi
sach ky » sach ty, sach kem, sach hay
hieu ve » hieu va, hieu van
ve nham » ve nha, ve cham
vai cua » dai cua, hai cua, lai cua
sac ky » cac ky, sai ky
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((((sach ky) or (sach y))) or (sac ky)) tang mai khoi. hieu ve nham thuc dan dinh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((((sach ky) OR (sach y))) OR (sac ky)) tang mai khoi. hieu ve nham thuc dan dinh vai cua te.
• Adding a wildcard symbol may retrieve word variants: thu ((((sach ky) or (sach y))) or (sac ky)) tang mai khoi. hieu ve nham thuc dan dinh vai cua te*.