Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh va » thanh van, hanh va, thanh ha
tu sach » thu sach, su sach, te sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
duc ban » duc tan, dua ban, duc man
duc van » duc va, duc tan, duc manh
va cua » va chua, via cua, ca cua
va cao » va cac, va co, va dao
cua te » cua tu

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