Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
thue nang » thien nang, thuat nang, thi nang
vien cac » vien bach, vien dai, vien da
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
ve cac » va cac
vi cua » vai 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: tu sach thue nang ma hoa. hieu ((ve cac) OR (vien cac)) ((duc va) or (duc tan)) hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thue nang ma hoa. hieu ((ve cac) OR (vien cac)) ((duc va) OR (duc tan)) hanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thue nang ma hoa. hieu ((ve cac) OR (vien cac)) ((duc va) or (duc tan)) hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: tu sach thue nang ma hoa. hieu ((ve cac) OR (vien cac)) ((duc va) or (duc tan)) hanh vi cua vat*.