Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nang mai » nang ma, nang tai, lang mai
sach ly » sach y, sach lo, sach ty
va tham » van tham, va thanh, va thuat
cu tren » tu tren, dua tren
va cham » va chat
mai hoi » mai khoi, dai hoi, lai hoi
ly nang » ky nang, ly hang, ly vang
cuu va » cuu ve
vi cu » vi su, vi xu, vi du

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 ly nang mai hoi. lieu ((va cham) OR (va tham)) ((cuu va) or (cuu van)) hanh vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ly nang mai hoi. lieu ((va cham) OR (va tham)) ((cuu va) OR (cuu van)) hanh vi cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ly nang mai hoi. lieu ((va cham) OR (va tham)) ((cuu va) or (cuu van)) hanh vi cu tren".
• Adding a wildcard symbol may retrieve word variants: thu sach ly nang mai hoi. lieu ((va cham) OR (va tham)) ((cuu va) or (cuu van)) hanh vi cu tren*.