Perhaps you should try some spelling variations:
thien van » thi van
nam thuc » nam thuoc, am thuc, nam thu
dua tren » dung tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
cu tren » tu tren
nam tu » nam thu

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

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