Perhaps you should try some spelling variations:
hoc thien » hoc hien, hoc thieu, hoc tien
hoc thiet » hoc thieu, hoc thuyet, hoc hien
canh manh » lanh manh, canh tranh, cach mang
dung cong » dung trong
than phan » thanh phan, toan phan, thanh pham
manh qua » manh quan, manh cua, danh qua
qua dung » quang dung, su dung, qua song
tan phan » toan phan, van phan, tai phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thien) or (hoc thiet)) anh - canh manh qua dung cong ((tan phan) OR (than phan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thien) OR (hoc thiet)) anh - canh manh qua dung cong ((tan phan) OR (than phan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thien) or (hoc thiet)) anh - canh manh qua dung cong ((tan phan) OR (than phan)) cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc thien) or (hoc thiet)) anh - canh manh qua dung cong ((tan phan) OR (than phan)) cau*.