Perhaps you should try some spelling variations:
nang tai » hang tai, tang tai, sang tai
tai khoi » tai khoa, mai khoi, tao khoi
cap nuoc » dat nuoc
dua tren » dung tren
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh

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 tai khoi. hieu va ((hoc nuoc) or (cap nuoc)) va hanh vi ((dua tren) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang tai khoi. hieu va ((hoc nuoc) OR (cap nuoc)) va hanh vi ((dua tren) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang tai khoi. hieu va ((hoc nuoc) or (cap nuoc)) va hanh vi ((dua tren) or (cau tren))*.