Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thu sach » tu sach, thuat sach, thuoc sach
su sach » so sach, vu sach
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
ve chao » ve chat, ve cham, ve cho
loai ca » loai cay, loai cua, loai va
xu van » tu van, vu van, su van
lai ca » lai cua, lai cam, bai ca

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 x ho. hieu ve chao xu van hanh ((lai ca) OR (loai ca)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ty nang x ho. hieu ve chao xu van hanh ((lai ca) OR (loai ca)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (su sach)) ty nang x ho. hieu ve chao xu van hanh ((lai ca) OR (loai ca)) viet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ty nang x ho. hieu ve chao xu van hanh ((lai ca) OR (loai ca)) viet*.