Perhaps you should try some spelling variations:
thanh sang » thanh san, thanh hang, thanh hoang
ban thanh » ban hanh, ban hang
thien van » thi van
lam duoc » nam duoc, luat duoc, lam thuoc
ky dung » ly dung, ky dang, ky vung
dung he » dung cho
nha hoc » nha thuoc, khoa hoc, nha nuoc
so sac » so sach, so dac
he hoi » le hoi, me hoi, he moi
sac ky » cac ky, sai ky
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky dung he hoi. thien van ((lam duoc) or (nha hoc)) ban thanh sang ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky dung he hoi. thien van ((lam duoc) OR (nha hoc)) ban thanh sang ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky dung he hoi. thien van ((lam duoc) or (nha hoc)) ban thanh sang ((cua te) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: so sac ky dung he hoi. thien van ((lam duoc) or (nha hoc)) ban thanh sang ((cua te) OR (cua tu))*.