Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
dau treo » dau tren, cau treo, dau theo
lieu ha » lieu nha, lieu va, lieu ma
hanh va » hang va, hanh vi
tu sac » tu sach, tu san, tu bac
nang o » nang co, nang ho, nang ro
va dau » va dao
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (tu cac)) ky nang o hoi. ((lieu ha) OR (liem ha)) nam thuc dan hanh va dau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu cac)) ky nang o hoi. ((lieu ha) OR (liem ha)) nam thuc dan hanh va dau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) or (tu cac)) ky nang o hoi. ((lieu ha) OR (liem ha)) nam thuc dan hanh va dau treo".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu cac)) ky nang o hoi. ((lieu ha) OR (liem ha)) nam thuc dan hanh va dau treo*.