Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
su sach » so sach, vu sach
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
va danh » va dinh, va dan, va hanh
danh va » doanh va, hanh va, anh va
ma hoi » mai hoi, xa hoi, ma hoa
v pham » d pham
va cua » va chua, via cua, ca cua
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: ((thu sach) or (su sach)) ty nang ma hoi. hieu ((v pham) OR (vi pham)) duc va danh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ty nang ma hoi. hieu ((v pham) OR (vi pham)) duc va danh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (su sach)) ty nang ma hoi. hieu ((v pham) OR (vi pham)) duc va danh va cua te".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ty nang ma hoi. hieu ((v pham) OR (vi pham)) duc va danh va cua te*.