Perhaps you should try some spelling variations:
thien van » thi van
dat ngoc » dat nuoc, dau ngoc, dang ngoc
vu sach » vu bach, su sach, vu khach
sach ly » sach y, sach lo, sach ty
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
cac toc » cac toi, cac nuoc, cac thoi
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ly nang xa hoi. thien van ((cac toc) or (dat ngoc)) va hanh vi ((hoa viet) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ly nang xa hoi. thien van ((cac toc) OR (dat ngoc)) va hanh vi ((hoa viet) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: vu sach ly nang xa hoi. thien van ((cac toc) or (dat ngoc)) va hanh vi ((hoa viet) or (cuu tre))*.