Perhaps you should try some spelling variations:
nang khoa » hang khoa, dang khoa, nang hoa
toc cach » hoc cach, toc sach, truoc cach
khoa hoc » hoa hoc
cach tu » cach thuc
tu nang » tru nang, tu nong, tu nano
hieu ve » hieu va, hieu van
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
cua cau » cua cac, cua chu, cua cay
ve cac » va cac, vien cac
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc cach tu nang khoa hoc. hieu ve cac ((xuc van) or (duc van)) anh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc cach tu nang khoa hoc. hieu ve cac ((xuc van) OR (duc van)) anh vi cua cau*.