Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
thai ky » thoi ky, than ky, thai ly
hieu va » lieu va, hieu qua
tai ky » trai ky, sai ky, dai ky
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((tai ky) OR (thai ky)) nang x hoi. hieu va cac ((luc va) or (thuc dan)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((tai ky) OR (thai ky)) nang x hoi. hieu va cac ((luc va) OR (thuc dan)) hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((tai ky) OR (thai ky)) nang x hoi. hieu va cac ((luc va) or (thuc dan)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: su ((tai ky) OR (thai ky)) nang x hoi. hieu va cac ((luc va) or (thuc dan)) hanh vi cua te*.