Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
duc phan » dung phan, duc thang, duc phung
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu lang » cu lang, tu lanh, xu lang
lang xa » lang ha, dang xay, lang van
ve cac » va cac
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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 xa hoi. hieu ((ve cac) OR (vien cac)) ((duc phan) or (duc va)) hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu lang xa hoi. hieu ((ve cac) OR (vien cac)) ((duc phan) OR (duc va)) hanh vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu lang xa hoi. hieu ((ve cac) OR (vien cac)) ((duc phan) or (duc va)) hanh vi cua tu".
• Adding a wildcard symbol may retrieve word variants: te sach tu lang xa hoi. hieu ((ve cac) OR (vien cac)) ((duc phan) or (duc va)) hanh vi cua tu*.