Perhaps you should try some spelling variations:
thuat sach » thuat san
thuat lanh » thuat lap, thuat san
sach ngan » sach ngon, sach nha, sach han
ngan lan » ngan han, ngan van, ngan can
ngon ky » ngon keo
su sach » so sach, vu sach
lan khi » ban khi, van khi, lan kho

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( ((thuat sach) OR (thuat lanh)) ngon ky thi đong luc ) or ( su sach ngan lan khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((thuat sach) OR (thuat lanh)) ngon ky thi đong luc ) OR ( su sach ngan lan khi đong luc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((thuat sach) OR (thuat lanh)) ngon ky thi đong luc ) or ( su sach ngan lan khi đong luc ))".
• Adding a wildcard symbol may retrieve word variants: (( ((thuat sach) OR (thuat lanh)) ngon ky thi đong luc ) or ( su sach ngan lan khi đong luc ))*.