Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
vien cac » vien bach, vien dai, vien da
thu sach » tu sach, thuoc sach, thu hoach
cau tren » cu tren, dau tren, ca tren
ty nang » ky nang, ty xang, ty hang
nang co » nang cao, nang doc, nang noi
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
co hoi » co hoc, co loi
xuc va » duc va, tuc va, luc va
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (thuat sach)) ty nang co hoi. hieu ((vien cac) or (va cac)) xuc va hanh ve cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) ty nang co hoi. hieu ((vien cac) OR (va cac)) xuc va hanh ve cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuat sach)) ty nang co hoi. hieu ((vien cac) or (va cac)) xuc va hanh ve cau tren".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuat sach)) ty nang co hoi. hieu ((vien cac) or (va cac)) xuc va hanh ve cau tren*.