Perhaps you should try some spelling variations:
cach thoi » cac thoi, cach thuc, cach noi
thoi tap » toi tap, hoc tap, thoi dai
cuu tong » cuu cong, cuu tinh, huu tung
tong hoc » tuong hoc, thong hoc, trong hoc
hoc nhan » hoc nhanh, nhoc nhan, hoc phan
nhan hoa » nhan khoa, phan hoa, thanh hoa
nhan dan » phan dau, gian dan, nhan tai
te cach » ve cach, te sach, tu cach
ha danh » han danh, hoa danh, ha anh
nhan va » nhan tai, nhan tao, phan van
hoc xa » hoc ma
xa ha » xa hoa, xa hai, la ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: te cach thoi tap, nghien cuu tong hoc nhan hoa hoc xa ha danh ((nhan va) OR (nhan dan))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cach thoi tap, nghien cuu tong hoc nhan hoa hoc xa ha danh ((nhan va) OR (nhan dan))".
• Adding a wildcard symbol may retrieve word variants: te cach thoi tap, nghien cuu tong hoc nhan hoa hoc xa ha danh ((nhan va) OR (nhan dan))*.