Perhaps you should try some spelling variations:
thien van » thi van
nam thuc » nam thuoc, am thuc, nam thu
dien cuc » dien tu, dieu cua, vien cac
va phan » van phan, va phat, va phap
va nhan » van nhan, ca nhan, va nha
te sach » toc sach
cu lang » cua lang, xu lang, chi lang
tu lang » tu lanh, xu lang, tu quang
cuc te » cua te, cuc thue, cuc tieu

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

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