Perhaps you should try some spelling variations:
thanh ca » thanh cha, thanh cac, thanh ha
thanh co » thanh do, thanh ho, thanh vo
te sach » toc sach
ty nang » ky nang, ty xang, ty hang
sach ty » sach y, sach tu, sach thu
duc gia » quoc gia
va cam » va cham, va cac, va cao
ve cai » va cai, ve cac, ve tai
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: te sach ty nang x ho. hieu ((ve cai) or (va cam)) duc gia ((thanh co) OR (thanh ca)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang x ho. hieu ((ve cai) OR (va cam)) duc gia ((thanh co) OR (thanh ca)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang x ho. hieu ((ve cai) or (va cam)) duc gia ((thanh co) OR (thanh ca)) cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang x ho. hieu ((ve cai) or (va cam)) duc gia ((thanh co) OR (thanh ca)) cua te*.