Perhaps you should try some spelling variations:
thien van » thi van
nham thuc » nhan thuc, nham thu, pham thuc
dan khanh » dang khanh, van khanh, dat khanh
nam thuc » nam thuoc, am thuc, nam thu
dan hanh » dang hanh, dan thanh, ban hanh
cac tren » ca tren, cau tren, rac tren
co sach » bo sach, cuon sach, hoc sach
sach ky » sac ky, sach y, sach ty

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ky nang x ho. thien van ((nham thuc) OR (nam thuc)) ((dan hanh) or (dan khanh)) va cac tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ky nang x ho. thien van ((nham thuc) OR (nam thuc)) ((dan hanh) OR (dan khanh)) va cac tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ky nang x ho. thien van ((nham thuc) OR (nam thuc)) ((dan hanh) or (dan khanh)) va cac tren".
• Adding a wildcard symbol may retrieve word variants: co sach ky nang x ho. thien van ((nham thuc) OR (nam thuc)) ((dan hanh) or (dan khanh)) va cac tren*.