Perhaps you should try some spelling variations:
thien van » thi van
toc cach » hoc cach, toc sach, truoc cach
thuc dan » thuc hanh, hoc dan, thuc vat
xu lang » cu lang, xu dang, xu quang
thuc va » thuc vat, thuc day
tu lang » cu lang, tu lanh, tu quang
hang di » hang doi, hang vi, hang dien
di cua » dai cua, doi cua, de cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc cach ((tu lang) OR (xu lang)) xa hoi. thien van nam ((thuc va) or (thuc dan)) hang di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc cach ((tu lang) OR (xu lang)) xa hoi. thien van nam ((thuc va) OR (thuc dan)) hang di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc cach ((tu lang) OR (xu lang)) xa hoi. thien van nam ((thuc va) or (thuc dan)) hang di cua te".
• Adding a wildcard symbol may retrieve word variants: toc cach ((tu lang) OR (xu lang)) xa hoi. thien van nam ((thuc va) or (thuc dan)) hang di cua te*.