Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
quan nam » quang nam, xuan nam, quan am
thuc van » thuc vat, thuc va, thuc hanh
thuc dan » thuc hanh, hoc dan, thuc vat
cau tren » cu tren, dau tren, ca tren
tu sai » tu bai, tu san, tu cai
sai ky » sac ky
nang o » nang co, nang ho, nang ro
vi cau » va cau, ve cau, di cau
o hoc » co hoc, mo hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky nang o hoc. hieu quan nam ((thuc van) or (thuc dan)) hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky nang o hoc. hieu quan nam ((thuc van) OR (thuc dan)) hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sai ky nang o hoc. hieu quan nam ((thuc van) or (thuc dan)) hanh vi cau tren*.