Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, lieu vien
van thanh » ban thanh, van tuan
vien cac » vien bach, vien dai, vien da
thuc van » thuc vat, thuc dan, thuc va
nang cho » nang chon, ngang cho, nang cao
cac thuc » cach thuc, cac thu, can thuc
vai cua » dai cua, hai cua, lai cua
te cach » te sach, tu cach, te cac
cho hoc » co hoc, khoa hoc
tu nang » tru nang, tu nong, tu nano
ve cach » va cach, ve cac, ve canh
vi cua » di cua

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) OR (ve cach)) tu nang cho hoc. hieu vien cac thuc van thanh ((vi cua) or (vai cua)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te cach) OR (ve cach)) tu nang cho hoc. hieu vien cac thuc van thanh ((vi cua) OR (vai cua)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te cach) OR (ve cach)) tu nang cho hoc. hieu vien cac thuc van thanh ((vi cua) or (vai cua)) cau*".