Perhaps you should try some spelling variations:
van tuan » van quan, van ban, anh tuan
te cach » ve cach, te sach, tu cach
cua cau » cua cac, cua chu, cua can
tuan vi » quan vi, luan vi, quans vi
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
cho hoc » co hoc, khoa hoc
xu lang » cu lang, xu dang, xu quang
tu lang » cu lang, tu lanh, tu quang
cua cay » cua cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: te cach ((tu lang) OR (xu lang)) cho hoc. hieu va cac duc van tuan vi ((cua cau) or (cua cay))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cach ((tu lang) OR (xu lang)) cho hoc. hieu va cac duc van tuan vi ((cua cau) OR (cua cay))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cach ((tu lang) OR (xu lang)) cho hoc. hieu va cac duc van tuan vi ((cua cau) or (cua cay))*".