Perhaps you should try some spelling variations:
thanh minh » thanh binh, thanh tinh, thanh vinh
tan thanh » tran thanh, tang thanh, toan thanh
cau tren » dau tren, ca tren, cau treo
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
sinh ky » sinh ly, kinh ky, minh ky
cac duc » cac du, cao duc, cac dac
van cac » van hac, van cau, van bac
xay hoi » xa hoi, tay hoi, cay phoi
cu tren » tu tren, dua tren
sinh y » sinh ly

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((sinh ky) or (sinh y)) dang xay hoi. hieu van cac duc tan thanh minh ((cau tren) OR (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sinh ky) OR (sinh y)) dang xay hoi. hieu van cac duc tan thanh minh ((cau tren) OR (cu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((sinh ky) or (sinh y)) dang xay hoi. hieu van cac duc tan thanh minh ((cau tren) OR (cu tren))".
• Adding a wildcard symbol may retrieve word variants: hoc ((sinh ky) or (sinh y)) dang xay hoi. hieu van cac duc tan thanh minh ((cau tren) OR (cu tren))*.