Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
vien cac » vien bach, vien dai, vien da
nang cau » nang cao, hang cau, nang dau
ty nang » ky nang, ty xang, ty hang
sach ty » sach y, sach tu, sach thu
danh va » doanh va, hanh va, anh va
tu sach » thu sach, su sach, te sach
ve cac » va cac
lao va » tao va, cao va, bao va
lo va » lo van, ly va, le va

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 ty nang cau hoi. hieu ((ve cac) or (vien cac)) ((lo va) OR (lao va)) danh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang cau hoi. hieu ((ve cac) OR (vien cac)) ((lo va) OR (lao va)) danh va su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang cau hoi. hieu ((ve cac) or (vien cac)) ((lo va) OR (lao va)) danh va su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang cau hoi. hieu ((ve cac) or (vien cac)) ((lo va) OR (lao va)) danh va su triet*.