Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
nang cai » nang cao, nang tai, nang cap
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
cai hoi » cau hoi, dai hoi, cai hoa
ty nang » ky nang, ty xang, ty hang

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 cai hoi. hieu va ((pham duy) OR (pham duc)) va thanh thai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang cai hoi. hieu va ((pham duy) OR (pham duc)) va thanh thai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang cai hoi. hieu va ((pham duy) OR (pham duc)) va thanh thai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang cai hoi. hieu va ((pham duy) OR (pham duc)) va thanh thai ((cua tre) or (cuu tre))*.