Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
van hac » van hoc, van ha, van hai
hac dao » hoc dao, tac dao, hat dao
dao van » do van, dang van
san ky » sang ky, van ky, dan ky
vi cua » vai cua, di cua

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 ky ((nang ma) OR (sang ma)) hoi. hieu van hac dao van hanh vi cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat san ky ((nang ma) OR (sang ma)) hoi. hieu van hac dao van hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: thuat san ky ((nang ma) OR (sang ma)) hoi. hieu van hac dao van hanh vi cua vat*.