Perhaps you should try some spelling variations:
ngoc thang » ngoc thanh, ngo thang, ngoc tuan
thang khoa » hang khoa, thong khoa, thanh hoa
phan cong » thanh cong
thoi dai » hoc dai, hoi dap, hoi dan
mot ngoc » mot goc, mot ngoai, mot nguoi
khoa hoc » hoa hoc
van phan » van phong, van thanh, luan phan
te cach » te sach, tu cach, te cac
ve cach » va cach, ve cac, ve canh
cuu mot » cua mot, cuu mo, huu mot
hoi van » hoi va, hoi dan, hai van
hoc xa » hoc ma

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) or (ve cach)) thoi dai, nghien cuu mot ngoc thang khoa hoc xa hoi van phan cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te cach) OR (ve cach)) thoi dai, nghien cuu mot ngoc thang khoa hoc xa hoi van phan cong.
• Adding a wildcard symbol may retrieve word variants: ((te cach) or (ve cach)) thoi dai, nghien cuu mot ngoc thang khoa hoc xa hoi van phan cong*.