Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
san thu » san thuc, van thu, san phu
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
qua cac » cua cac
va hanh » van hanh, va thanh, va danh
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: thuat san thu ((nang ma) or (tang ma)) hoi. hieu qua cac nuoc va hanh vi ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat san thu ((nang ma) OR (tang ma)) hoi. hieu qua cac nuoc va hanh vi ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat san thu ((nang ma) or (tang ma)) hoi. hieu qua cac nuoc va hanh vi ((cua te) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: thuat san thu ((nang ma) or (tang ma)) hoi. hieu qua cac nuoc va hanh vi ((cua te) OR (cua tu))*.