Perhaps you should try some spelling variations:
nang khoa » hang khoa, dang khoa, nang hoa
cham xuc » cam xuc, chat xuc, cham soc
khoa hoc » hoa hoc
sach ky » sac ky, sach y, sach kem
dau cua » dai cua, day cua, cau cua
va hanh » van hanh, va thanh, va danh
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((sach ky) or (sach ty)) nang khoa hoc. hieu vu cham xuc ((va hanh) or (va dan)) dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sach ky) OR (sach ty)) nang khoa hoc. hieu vu cham xuc ((va hanh) OR (va dan)) dau cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc ((sach ky) or (sach ty)) nang khoa hoc. hieu vu cham xuc ((va hanh) or (va dan)) dau cua tre*.