Perhaps you should try some spelling variations:
thuat anh » thuat lanh, thuat canh, thuat nganh
dua tren » dung tren
duc tuan » duc thuan, duc tan, duc toan
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
sang ma » tang ma, sang tao, mang may
dao duc » giao duc, tao duoc
nang ma » tang ma, nang cao, mang may
anh bai » sach bai, danh bat, hinh bai
anh y » hanh y, anh d, anh _

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat anh y ((nang ma) or (sang ma)) hoa. hieu van dao duc tuan anh bai ((dua tren) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat anh y ((nang ma) OR (sang ma)) hoa. hieu van dao duc tuan anh bai ((dua tren) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: thuat anh y ((nang ma) or (sang ma)) hoa. hieu van dao duc tuan anh bai ((dua tren) or (su triet))*.