Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nang mai » nang ma, nang tai, lang mai
thanh va » thanh van, hanh va, thanh ha
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » hieu qua
soc va » loc va, doc va, goc va
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 ky nang mai hoi. ((hieu va) or (lieu va)) cham ((soc va) OR (hoc va)) thanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang mai hoi. ((hieu va) OR (lieu va)) cham ((soc va) OR (hoc va)) thanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang mai hoi. ((hieu va) or (lieu va)) cham ((soc va) OR (hoc va)) thanh va cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang mai hoi. ((hieu va) or (lieu va)) cham ((soc va) OR (hoc va)) thanh va cua te*.