Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
nuoc sach » nguoi sach, hoc sach, cuoc cach
sach thoi » cach thoi, sach hoi, sach tham
hoc nganh » hoc nhanh
thoi tap » toi tap, hoc tap, thoi dai
khoa hoc » hoa hoc
van luan » van quan, van tuan, von luan
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
ma hai » ta hai, xa hai, manh hai
va hai » van hai, va chai, va khai

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

• Performing a fuzzy search may retrieve terms with similar spellings: nuoc sach thoi tap, nghien cuu mot hoc nganh khoa hoc ((ma hai) OR (va hai)) van luan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach thoi tap, nghien cuu mot hoc nganh khoa hoc ((ma hai) OR (va hai)) van luan van".
• Adding a wildcard symbol may retrieve word variants: nuoc sach thoi tap, nghien cuu mot hoc nganh khoa hoc ((ma hai) OR (va hai)) van luan van*.