Perhaps you should try some spelling variations:
thuoc cach » thuoc sach, thuc cach, truoc cach
tuong tac » cong tac, luong tai, tuong lai
tang khoa » hang khoa, dang khoa, tang kha
tong tap » trong tan, cong tac, tong hop
hoc tang » hoc bang, hoc tan, hoc tieng
khoa hoc » hoa hoc
von luan » tong luan
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc
hai von » hai van, hai con, hai son
hoc xa » hoc ma
xa hai » xa thai, xua hai, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc cach ((tong tap) OR (tuong tac)), nhiem huu mot hoc tang khoa hoc xa hai von luan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc cach ((tong tap) OR (tuong tac)), nhiem huu mot hoc tang khoa hoc xa hai von luan van".
• Adding a wildcard symbol may retrieve word variants: thuoc cach ((tong tap) OR (tuong tac)), nhiem huu mot hoc tang khoa hoc xa hai von luan van*.