Perhaps you should try some spelling variations:
tham nuoc » thay nuoc, thoat nuoc, pham ngoc
ban hanh » ban hang
toc sach » hoc sach, doc sach, thuoc sach
cua viet » ca viet, hoa viet, cua vat
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky lang ha hoi. hieu va ((tham nuoc) OR (nha nuoc)) ban hanh vi ((cua tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang ha hoi. hieu va ((tham nuoc) OR (nha nuoc)) ban hanh vi ((cua tre) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky lang ha hoi. hieu va ((tham nuoc) OR (nha nuoc)) ban hanh vi ((cua tre) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang ha hoi. hieu va ((tham nuoc) OR (nha nuoc)) ban hanh vi ((cua tre) or (cua viet))*.