Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
dan tai » van tai, dan thi, han tai
cua tre » cuu tre, cua triet, dua tren
ve cao » va cao, ve bao, ve cac
va dan » ca dan, va dao, va dau
cua te » cua tu
su va » su van, tu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang ma hoa. hieu ve cao su va dan tai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ma hoa. hieu ve cao su va dan tai ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ma hoa. hieu ve cao su va dan tai ((cua tre) or (cua te))*.